Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fb2d3d82f92487f…

MALICIOUS

PDF

40.3 KB Created: 2020-08-19 19:52:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e7476263a471bc27498f18a3683f9232 SHA-1: 938c5d6e0f8d1e20facb2fa02471acfcf901d6e1 SHA-256: 6fb2d3d82f92487f388e330cb944530115ef81d852a4c8c9af33bffa45c2a1bc
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, identified as a link farm, pointing to various PDF files hosted on external sites. One of these links, https://ttraff.ru/pify?keyword=video+from+instagram+story, is flagged as a malicious redirector. This suggests the document's primary purpose is to direct users to potentially malicious or spam-related content, possibly for SEO manipulation or to serve as a distribution point for further threats. No scripts were extracted, but the presence of embedded URLs and the link farm heuristic strongly 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/pify?keyword=video+from+instagram+story
    • http://files.rnscmasters.org/uploads/1/3/0/8/130813612/4405064.pdf
    • http://files.kayaksissy.com/uploads/1/3/1/6/131636969/1c8a3.pdf
    • http://wozepog.countertruth.com/uploads/1/3/2/8/132814930/zarewukenisaxe_mesabudipewe.pdf
    • http://files.lorokawirehairedvizslas.com/uploads/1/3/0/7/130775598/4111825.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/1619/9066/files/pozozimilawuderesixusapev.pdf
    • https://cdn.shopify.com/s/files/1/0432/8102/3132/files/saketidarisajovinetax.pdf
    • https://cdn.shopify.com/s/files/1/0437/7785/1550/files/bovine_serum_albumin_adalah.pdf
    • https://cdn.shopify.com/s/files/1/0431/4251/2802/files/visaw.pdf
    • https://cdn.shopify.com/s/files/1/0440/6149/1352/files/dulobo.pdf
    • https://cdn.shopify.com/s/files/1/0433/5498/0505/files/77746803352.pdf
    • https://cdn.shopify.com/s/files/1/0429/2077/1750/files/corpsman_manual.pdf
    • https://cdn.shopify.com/s/files/1/0437/1569/0650/files/chagas_tratamento.pdf
    • https://cdn.shopify.com/s/files/1/0434/1052/2277/files/4635868965.pdf
    • https://cdn.shopify.com/s/files/1/0430/8713/4882/files/viropixujarizibukeguvujub.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_off00006178.bin
e1af8d085ca2ce8b92c524878cb897f68c1ed0584ebacef2443dccb9a43b0d2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6178 5264 bytes
font_01_sfnt_off0000734c.bin
d5ec49362fcf6fd33e9b7de9f88a688daba1eb4476424a65f3a02da8f6f0066e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x734C 9576 bytes

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