Malicious PDF — malware analysis report

Static analysis result for SHA-256 dab9aa6eb07d4ddf…

MALICIOUS

PDF

37.6 KB Created: 2020-08-24 17:46:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 12601c3d14047deeeb4ca7bd0f950dc9 SHA-1: e17e28d166f5fbce7397ffe42d35ae75ffa5b779 SHA-256: dab9aa6eb07d4ddfcfda729fe1237d018469c78e22c75cfc95afa77ccf434542
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector service (ttraff.ru). This indicates a link farm designed to obscure the final destination, which is likely malicious. The document body, though heavily obfuscated, contains references to a worksheet answer key, suggesting a lure. No scripts were extracted, but the PDF structure and link farm are strong indicators of 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=ffa+creed+worksheet+answer+key
    • http://zafabi.trimhairlafayette.com/uploads/1/3/2/6/132695832/tedosojimireg_kokebinaru_duwenejirop.pdf
    • http://kibezixon.mzsacredhealing.com/uploads/1/3/1/4/131453872/5855726.pdf
    • http://files.magnifiscentsoap.com/uploads/1/3/0/7/130740458/befa6d61.pdf
    • https://cdn.shopify.com/s/files/1/0430/5489/1161/files/nero_welcome_reality.pdf
    • https://cdn.shopify.com/s/files/1/0430/9978/3319/files/85564304312.pdf
    • https://cdn.shopify.com/s/files/1/0435/5283/3687/files/sawemoj.pdf
    • https://cdn.shopify.com/s/files/1/0429/8915/8554/files/wagebezinixomavopik.pdf
    • https://cdn.shopify.com/s/files/1/0431/7364/2406/files/how_to_install_tails.pdf
    • https://cdn.shopify.com/s/files/1/0432/6916/1110/files/vesorexap.pdf
    • https://cdn.shopify.com/s/files/1/0436/2931/4206/files/woxofowomuxunirimetonen.pdf
    • https://cdn.shopify.com/s/files/1/0435/5185/0647/files/powerful_adverbs_list.pdf
    • https://cdn.shopify.com/s/files/1/0432/6581/8789/files/difilupudevakumoborinaxi.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005442.bin
1c3d056e6d66714125f2f99beb097fa2b37c729ba4cfad3ef3f2b68c9093663a
pdf-font-stream PDF embedded font (sfnt) at offset 0x5442 5292 bytes
font_01_sfnt_off00006656.bin
3552a01a7d1f143949377f14c2497b2c87986e5c2a91058f1c98493abeb01cda
pdf-font-stream PDF embedded font (sfnt) at offset 0x6656 10552 bytes