Malicious PDF — malware analysis report

Static analysis result for SHA-256 8742c50a28fe833d…

MALICIOUS

PDF

72.3 KB Created: 2020-10-30 04:15:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: ee4b4f3497e908754609a48f142b9b99 SHA-1: 2bdd691a143e24e8397b170c4c6a0ba29d04eb48 SHA-256: 8742c50a28fe833dd9b6d644a44f034e07d93187b25a8cf205027defb0a3a0b7
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to disposable hosting services and ultimately redirect to malicious infrastructure. The primary purpose appears to be SEO manipulation and driving traffic to potentially harmful sites, as indicated by the link farm heuristics and the critical redirector link firing. No scripts were extracted, and the document body is largely obfuscated, but the presence of numerous external links is the main indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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://ttraff.club/123?keyword=antigone+in+ferguson+harlem+stage In PDF document text
    • https://kawuloxegulul.weebly.com/uploads/1/3/4/3/134389306/e6c737.pdfIn PDF document text
    • https://jagamasukibo.weebly.com/uploads/1/3/4/4/134493784/2109039.pdfIn PDF document text
    • https://buximinolid.weebly.com/uploads/1/3/1/3/131381316/mawagawe.pdfIn PDF document text
    • https://zeteparikimifol.weebly.com/uploads/1/3/1/6/131637109/rigugomar_wifuxivep_bupukewufi.pdfIn PDF document text
    • https://wefolukozik.weebly.com/uploads/1/3/1/4/131406413/2624410.pdfIn PDF document text
    • https://vivazezege.weebly.com/uploads/1/3/4/0/134041722/6185151.pdfIn PDF document text
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/ea1eadc07ab.pdfIn PDF document text
    • https://sazoxizifa.weebly.com/uploads/1/3/4/5/134505384/xotox-vixexiviwojuzev.pdfIn PDF document text
    • https://jemajodelevo.weebly.com/uploads/1/3/4/3/134394711/jipadedavolo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d0acbcb-1de4-4cf6-b48c-d7b0d89a0c44/araba_iten_srme.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b98980b8-5d01-46ca-8c53-6465f76a36d1/bills_of_exchange_act_united_states.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5813a7b-0da3-4ec4-935e-2cb661f4bafe/24921644484.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c281.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC281 5172 bytes
SHA-256: 55723f15d0da19e0bb5b8d86730d9e055f6d4d99ee18d1bc49635726cef25381
font_01_sfnt_off0000d3f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F7 13092 bytes
SHA-256: 7023600faa0dfc1b496bfc5556466f0856de229c648202138a6783b4de3ad804
font_02_sfnt_off0000fe1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE1D 16296 bytes
SHA-256: 02adb6a73ccd8cb6089057e262e30f4c74d7df448a2d582ac10604b572cac8e5

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