Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e142c7d7942c79c…

MALICIOUS

PDF

76.2 KB Created: 2020-10-17 06:11:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 7743912e5c9625306fc886cfe1f06f16 SHA-1: bb5a109e17524c8e1a2f5ab69cebd09b9d67efee SHA-256: 6e142c7d7942c79c137cf35c0205605e09b61aaedd394beef06b43cdc9de8057
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm designed to redirect users. One prominent URL, https://gettraff.ru/strik?keyword=iktisat+ders+notlar%25C4%25B1+1+s%25C4%25B1n%25C4%25B1f, is flagged as malicious. The document body, though heavily obfuscated, contains references to academic notes, suggesting a lure to trick users into clicking the malicious links. No scripts were extracted, but the PDF structure and embedded links strongly indicate a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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/strik?keyword=iktisat+ders+notlar%25C4%25B1+1+s%25C4%25B1n%25C4%25B1f In PDF document text
    • https://cdn-cms.f-static.net/uploads/4367952/normal_5f88d7162aea1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369160/normal_5f8850f74500c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365560/normal_5f8700dda5834.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376874/normal_5f89b9611c655.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373999/normal_5f897b3f5483a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0436/4802/4741/files/zinefisuripunategogutof.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/5852/7897/files/mac_lustre_lipsticks_swatches.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0433/8077/files/37777083954.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3095/3627/files/dofosogol.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/8956/3299/files/30711200961.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/7723/1275/files/69000103210.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/3712/0933/files/sivedekevuvunuxorusow.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/5298/8566/files/96567297026.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7047/9772/files/frankenstein_chapter_1-4_quotes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79475cda-c8da-40f4-bfba-e8f522ca89d6/rokopuzube.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/385a83e5-0e17-446b-8e31-d67b30e5f072/zofakumino.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd5993e4-c44e-4770-81e1-a3189fcbe4db/78552197316.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/799a5c8a-729b-4d3b-81b2-21e88a567e2c/tiwozozeronoxelevetomop.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE37 4772 bytes
SHA-256: 343abf17bd26c142302783b7f8615e5d763052afd6009fa60384d98cd1eb8a28
font_01_sfnt_off0000ee71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE71 11892 bytes
SHA-256: 6e043e31ccdcaff79b33adba7ad8acc692f0f141c20fabf1cc03ceb06266b00b
font_02_sfnt_off0001133b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1133B 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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