Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cfcf95d55a9f980…

MALICIOUS

PDF

54.3 KB Created: 2020-10-27 19:43:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: b1140eb1c5de5d9ca05f6dad96d733ad SHA-1: 77ce5b1c238e4e80c932dcc073486b60b5e3e6bc SHA-256: 2cfcf95d55a9f98057b80f9c6a0850c12923a01c31abf7de12d299e804ab8d03
184 Risk Score

Malware Insights

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

The PDF file was flagged by multiple critical heuristics indicating it links to malicious redirector infrastructure and functions as a link farm on disposable hosting. The embedded URL and numerous other links suggest an attempt to lure users to potentially malicious sites, possibly for SEO manipulation or malware distribution. The ML classifier also strongly indicated maliciousness.

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.link/123?keyword=best+oil+filter+wrench+for+honda In PDF document text
    • https://jubunukaf.weebly.com/uploads/1/3/1/4/131483214/gunis_gudojeziz_bebopukesuxo_rodisubababib.pdfIn PDF document text
    • https://sirawomaperuli.weebly.com/uploads/1/3/1/3/131398091/03103613c.pdfIn PDF document text
    • https://luwamagol.weebly.com/uploads/1/3/4/3/134375262/5486901.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378175/normal_5f8b6781a7d3b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421039/normal_5f984a80dc748.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373778/normal_5f8cb900f36f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368468/normal_5f88a41feffc3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369142/normal_5f87b3645f10c.pdfIn PDF document text
    • https://daputonekamipit.weebly.com/uploads/1/3/0/7/130775603/cf165bd78d.pdfIn PDF document text
    • https://bawuzuxagoju.weebly.com/uploads/1/3/4/3/134340420/5855868.pdfIn PDF document text
    • https://nazuvunu.weebly.com/uploads/1/3/4/4/134438845/9705e15d09.pdfIn PDF document text
    • https://vekejuritikoj.weebly.com/uploads/1/3/1/8/131857631/tapirerurapomibutar.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/562fd5d6-100c-4d52-9442-eec291f3c72d/kikaxetenakesevasuvaxadij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/831fb3c5-dbdb-4db0-ab47-eb54d6bdc22d/21938869522.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8f319fe-8f57-4e7d-b683-5756fc48da95/29752416655.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c70c0b5-4aaa-4821-ac36-58f1497da201/wanijulibosonow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d25a3785-ea4a-42db-8265-64123ec112e4/18k_gf_l_quintal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/720ba7d2-5d58-4fb9-814c-cd3e62fca1eb/tilekawojezox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/459daebd-b75a-4477-8ec7-0cd3c9fb4b2a/mekejedetakerunotalag.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_off00009584.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9584 5248 bytes
SHA-256: 03af10baca658c9d52f749d40e8373483814c8281c95a37765243788bbac6c88
font_01_sfnt_off0000a763.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA763 10744 bytes
SHA-256: 660b955f00c0799d5794ff20925bee11310517bd1d9545c5e3bed207d74d3c55

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