Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac1607f37ecf11f2…

MALICIOUS

PDF

70.1 KB Created: 2020-12-11 05:05:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 70027598060b3a1d25b39883e5eef758 SHA-1: 9e04e1ffeb3851b4a6d5b8df56bee119671e7411 SHA-256: ac1607f37ecf11f25fb477c38565596c88fa848768b5dcd6ddb7902648d969d1
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm or SEO manipulation tactic. The primary external URL, 'https://traffking.ru/strik?utm_term=dragon+ball+z+super+saiyan+levels', is likely used to redirect users to potentially malicious content. The ML classifier strongly indicated maliciousness, supporting the assessment of a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://traffking.ru/strik?utm_term=dragon+ball+z+super+saiyan+levels PDF link annotation
    • https://xarugowa.weebly.com/uploads/1/3/4/7/134733051/8ca74.pdfIn PDF document text
    • https://mupififidimob.weebly.com/uploads/1/3/4/2/134234858/nafagirosodije_kebevimazeg_gepemifulid.pdfIn PDF document text
    • https://witorovi.weebly.com/uploads/1/3/4/6/134643219/09182d963c.pdfIn PDF document text
    • https://jezugazaditok.weebly.com/uploads/1/3/4/6/134601365/judamu.pdfIn PDF document text
    • https://jobugatiponez.weebly.com/uploads/1/3/4/2/134234820/8702c0598e6326b.pdfIn PDF document text
    • https://jerexibim.weebly.com/uploads/1/3/4/6/134654770/9981312.pdfIn PDF document text
    • https://siregudak.weebly.com/uploads/1/3/0/7/130738759/1477395.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/a885aa26-99a5-4d43-a9d3-93afa7a25176/comprehensive_stress_management_14th_edition_free.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbfff2111f6a4198480a438/t/5fc1665a9d79364840c2260a/1606510170402/92128662198.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2a24d085bf90c0e084acd/t/5fcc39c8d336b863f0b52af8/1607219657085/sexirolif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/173a6036-0401-4a32-a911-527dbcc59f04/girls_frontline_black_card.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc68dcde9fc3622d549048f/t/5fce702035275e16e228a599/1607364641415/64954545604.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_off0000d6d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D8 5340 bytes
SHA-256: 3a24ab94b615962fb4fd282b360a8ec0f489fe5898d3f0c789f3550272efbe25
font_01_sfnt_off0000e926.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE926 10056 bytes
SHA-256: f9fa2bef600224158f2bb781fef7e773dc348ab864cdc23d81a6d2ef3180a4d5

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