Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f8b2a27ffd97710…

MALICIOUS

PDF

50.1 KB Created: 2020-09-01 01:19:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8784ba14ee820161be1d1f789286d810 SHA-1: f85987561f01ea5c31c02edb9f4e1a01be419603 SHA-256: 6f8b2a27ffd9771017894dee2fa81c9c3491641b48bbc4935183fdecee24d6fe
154 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, many pointing to benign Shopify-hosted PDFs, but also includes a critical link to a known malicious redirector at `https://ttraff.ru/wix?keyword=vyond+mod+apk`. This suggests the document is part of a link farm or SEO poisoning campaign designed to drive traffic to malicious infrastructure. No scripts were extracted, but the presence of embedded URLs and the ML classifier's high confidence indicate malicious intent.

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://ttraff.ru/wix?keyword=vyond+mod+apk
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/8140/8416/files/michelin_star_guide_2019_nyc.pdf
    • https://cdn.shopify.com/s/files/1/0432/6585/1542/files/97352354067.pdf
    • https://cdn.shopify.com/s/files/1/0437/4816/3735/files/zasip.pdf
    • https://cdn.shopify.com/s/files/1/0430/3601/6802/files/85817961598.pdf
    • https://static.usrfiles.com/ugd/eb4c03_441b05646ee6414391ac1a8cc64f812e.pdf
    • https://static.usrfiles.com/ugd/01e791_36c13be398464bb181fc87fafd39aa48.pdf
    • https://static.usrfiles.com/ugd/b7ed05_a950cbb486664209aaa9a280b98acab7.pdf
    • https://static.usrfiles.com/ugd/b8c837_afbed24747424c868d89aeb25c9ee842.pdf
    • https://static.usrfiles.com/ugd/50de67_aa366f05045f4be6b3624b4f5df73c27.pdf
    • https://static.usrfiles.com/ugd/122077_8bb60e3fda3c407898fd874ba92ebf16.pdf
    • https://static.usrfiles.com/ugd/74a852_c177aea22dc842a595b0ac0d80c8802c.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000067eb.bin
5316e8917d11529549f0ee773640f3b7261fa97466e7330a6dd57671a16cc011		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67EB 4932 bytes
font_01_sfnt_off000078a7.bin
c34e5c0a7bee8c7f5a0dd576f7bc83357d2d23c0f0c4fc3add6c5609f21fba98		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78A7 2312 bytes
font_02_sfnt_off000082f7.bin
a3822e29036d338dd91cb3e8017760b27848b67982e6704786e9b4c0e8b20fe3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82F7 10288 bytes
font_03_sfnt_off0000a663.bin
c7d17638ddface7a0b09e00e62009c23cc75be0f04b4a0db56ef4524d7ab3f6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA663 16196 bytes

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