Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bbe2f765b0d97f7…

MALICIOUS

PDF

78.2 KB Created: 2021-01-04 17:37:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ed65ec881b3bf1fa9338b17dbc6fc5ee SHA-1: d8eb11a0c2aa53b035957135d90ba06ebfba8d72 SHA-256: 4bbe2f765b0d97f7fa6c7856748962feb0dca6ab6ab8a43d6457827bd686c209
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a mass of external links, many pointing to disposable hosting, and one critical link to a known malicious redirector. The ML classifier and ClamAV also flagged this PDF as malicious, indicating it's likely part of a phishing campaign or used to distribute malware. No scripts were extracted, but the embedded URLs and link farm structure strongly suggest a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://gettraff.ru/aws?utm_term=galaxy+s8+play+store++pending
    • https://cdn-cms.f-static.net/uploads/4366044/normal_5f90f71345eff.pdf
    • https://fategebedabeno.weebly.com/uploads/1/3/4/7/134718848/085e8efba9fb565.pdf
    • https://static.s123-cdn-static.com/uploads/4490001/normal_5fee8c4e46a49.pdf
    • https://munuteme.weebly.com/uploads/1/3/4/8/134862418/b661378f0b78d9b.pdf
    • https://cdn-cms.f-static.net/uploads/4374853/normal_5f8c06a69e766.pdf
    • https://visuzajekug.weebly.com/uploads/1/3/4/3/134305902/62b08a4407d4e.pdf
    • https://static.s123-cdn-static.com/uploads/4465263/normal_5fe30d21949b8.pdf
    • https://wutawodasigupo.weebly.com/uploads/1/3/4/5/134512212/6094b27267c.pdf
    • https://dotaterezisal.weebly.com/uploads/1/3/4/7/134771172/fosimavadotexa.pdf
    • https://cdn-cms.f-static.net/uploads/4422643/normal_5fa6322187531.pdf
    • https://bobiputab.weebly.com/uploads/1/3/2/8/132814039/7108634.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/panokojol/8th_grade_go_math_book_answers.pdf
    • https://uploads.strikinglycdn.com/files/669947f4-5983-42ae-97cb-5959ae60e590/zisid.pdf
    • https://uploads.strikinglycdn.com/files/021765fe-c8f0-4ede-99c0-66f4c126f856/sutuj.pdf
    • https://s3.amazonaws.com/genedesowul/gipobuwigalupota.pdf
    • https://uploads.strikinglycdn.com/files/4b80c915-c733-4731-b978-9420314fde48/libro_viaje_a_la_semilla.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f490.bin
db07f7f7cea684555b0801f36166d80bddce0bfb00497bb87cb70f3bf2527fbb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF490 5524 bytes
font_01_sfnt_off00010774.bin
d091fc7bc0598f8297a0c696dabceedd77a1979f58b5e9476af5f17537a8c412		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10774 10584 bytes

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