Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c98514962b97f12…

MALICIOUS

PDF

50.5 KB Created: 2020-10-16 15:56:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 861b5a2a8c149ec9032958bf0494d1d2 SHA-1: 62bde5ca4764f380ee11a13fd9464bedffbcd3a2 SHA-256: 6c98514962b97f120aa0f9c756617475fddb58f11b61194fea10a55c3aaeb814
192 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, many pointing to disposable hosting and redirectors, indicating a link farm or SEO poisoning attempt. One critical heuristic identified a link to known malicious redirector infrastructure. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious link farm designed to lure users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://cctraff.ru/pify?keyword=abdominal+compartment+syndrome+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4371799/normal_5f88c0523432d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366035/normal_5f87472c5516b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368732/normal_5f87b9bfaed60.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369506/normal_5f8886d4dfa95.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368958/normal_5f87b179e3607.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365635/normal_5f870456cce82.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366984/normal_5f8742ede7e28.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366304/normal_5f872a4d2e8d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369142/normal_5f894b131595d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366382/normal_5f87dbba0982d.pdfIn PDF document text
    • https://vuzevarezevarot.weebly.com/uploads/1/3/0/7/130740461/fisewoludemadijop.pdfIn PDF document text
    • https://mogilifus.weebly.com/uploads/1/3/0/7/130739831/aa92d.pdfIn PDF document text
    • https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/novovuxosijuzuz_wofabunutigepuw_dugulelura.pdfIn PDF document text
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/3373854.pdfIn PDF document text
    • https://vilukenuxe.weebly.com/uploads/1/3/2/8/132814007/16c7aba32.pdfIn PDF document text
    • https://kekerisasil.weebly.com/uploads/1/3/0/7/130775365/dorafagupalaku.pdfIn PDF document text
    • https://porelananov.weebly.com/uploads/1/3/0/7/130775759/3365925.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/1877/9306/files/nedotirolazuvaf.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/9816/7709/files/intex_explorer_k2_kayak_review.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0478/2456/8479/files/the_power_of_your_supermind.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5706/1781/files/wind_turbine_explosion.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/6148/9049/files/high_top_dread_braids.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1cd27193-1e76-4a25-9d49-66d8baa88d4e/85719361764.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb80e959-2438-4488-a873-42c358a26cc2/59244759524.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/282e4c71-f98a-441d-9d69-8c94dccfc4fd/94461744064.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/533c2923-dc4b-4117-b3d9-963416220a7c/gusidizupobijejori.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5360ffd7-ffe4-48f6-b503-4f219a2a7e6e/31518097618.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000084f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84F2 5532 bytes
SHA-256: 7522e3013b2f328df552f6a3ebc761c57f1ab56e720c29b822a44a7e443151fe
font_01_sfnt_off000097a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x97A4 10536 bytes
SHA-256: b6e68e1484f0ab2b4f529b0ed70b39f0ea4a8ff33d0847b74e739d95c3b73c89

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