Malicious PDF — malware analysis report

Static analysis result for SHA-256 403eb457654e8c72…

MALICIOUS

PDF

56.1 KB Created: 2020-08-03 21:49:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 18201aafa216a2716b646d074facc4d7 SHA-1: c0a98f4261c816a2fb0177b716d915987830ed7e SHA-256: 403eb457654e8c720e86b1781e9b8d43845b67bad826342bb985fae7bebe3c14
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

This PDF file exhibits characteristics of a link farm, with numerous embedded URLs. A critical heuristic identified a link to a known malicious redirector, 'ttraff.cc', which likely serves as a gateway to further malicious content. The majority of the links point to Shopify-hosted PDFs, suggesting an attempt to leverage legitimate platforms for malicious distribution or SEO manipulation. The ML classifier strongly indicated maliciousness, supporting the assessment of a malicious redirector and link farm attack pattern.

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.cc/pify?keyword=arraylist+em+java+pdf
    • http://files.nationalbusinesseducationweek.com/uploads/1/3/1/8/131856435/tojaridiw.pdf
    • http://files.mobile-autoelectrical.com/uploads/1/3/1/8/131856498/fc1fb.pdf
    • http://files.gulfsidesports.com/uploads/1/3/0/7/130776714/nugisurofep-vuloxise-xojuzobepa.pdf
    • http://files.ellenalt.com/uploads/1/3/1/4/131438419/329806.pdf
    • https://cdn.shopify.com/s/files/1/0430/5698/8317/files/pixukavevufamame.pdf
    • https://cdn.shopify.com/s/files/1/0434/4614/1093/files/mutated_bloodveld_osrs.pdf
    • https://cdn.shopify.com/s/files/1/0432/3947/3314/files/63347842791.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kepikopu.pdf
    • https://cdn.shopify.com/s/files/1/0428/8777/4374/files/nodupakavobekopej.pdf
    • https://cdn.shopify.com/s/files/1/0430/8110/5575/files/buzozub.pdf
    • https://cdn.shopify.com/s/files/1/0437/6949/5710/files/14575760139.pdf
    • https://cdn.shopify.com/s/files/1/0431/6931/7020/files/48461054604.pdf
    • https://cdn.shopify.com/s/files/1/0433/6576/1176/files/47832824525.pdf
    • https://cdn.shopify.com/s/files/1/0433/7437/9173/files/tuwipibawivasude.pdf
    • https://cdn.shopify.com/s/files/1/0434/6085/3920/files/xiwapuj.pdf
    • https://cdn.shopify.com/s/files/1/0430/6383/6834/files/76870037782.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0000b5fd.bin
c7fa5d65c410174a5acac4571a6446f65bec60c48b1a0043f302f99acdb71c6e		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xB5FD 18644 bytes
font_00_sfnt_off000076da.bin
3e84e57466b460604aa30a3e8ba00f171361f0b9aaed8ea532b171693f3bcc25		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76DA 5412 bytes
font_01_sfnt_off00008948.bin
9186c17b13515ea9c3547dabf4767f0fb25719045874c7d163a6606d58055156		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8948 14264 bytes

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