Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cda8d73fe118dc4…

MALICIOUS

PDF

57.2 KB Created: 2020-08-12 01:09:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d497836241dbfa17546c686872ef20f0 SHA-1: b176a4ac69fb3260d9d9ce0e0862d564a00d080d SHA-256: 0cda8d73fe118dc42f148039a11ebe5ebebf426b56d84d8c087b78975b8d321f
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to a link farm designed to obscure the ultimate destination. One critical heuristic identified a link to a known malicious redirector at `https://ttraff.ru/pify?keyword=introduction+cluster+computing+pdf`. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and link farm suggest an attempt to deliver a malicious payload or phish credentials.

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=introduction+cluster+computing+pdf
    • http://pokiru.kathrynyarbrough.org/uploads/1/3/0/7/130739777/govot_gameruba.pdf
    • http://files.sfsailing.org/uploads/1/3/2/6/132695915/vurobazavarew_redipumuwope_todamorifujonil_davanonawufig.pdf
    • http://kanixop.megaplot.org/uploads/1/3/1/6/131606490/tavuzizutewelani.pdf
    • http://lofit.jewellerybyjody.com/uploads/1/3/1/4/131452938/zunugewofamu-jevavi-padid-fifusin.pdf
    • http://files.theequinelink.net/uploads/1/3/1/3/131384721/3302223.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/2990/5058/files/sipubumapenugemudegel.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/61259485886.pdf
    • https://cdn.shopify.com/s/files/1/0429/6015/8873/files/nikal.pdf
    • https://cdn.shopify.com/s/files/1/0428/8741/3923/files/kugimoxupeg.pdf
    • https://cdn.shopify.com/s/files/1/0436/2951/0814/files/josijan.pdf
    • https://cdn.shopify.com/s/files/1/0432/1411/0880/files/ankylosing_spondylitis_book.pdf
    • https://cdn.shopify.com/s/files/1/0450/7097/5128/files/animal_cell_culture_and_technology_butler.pdf
    • https://cdn.shopify.com/s/files/1/0427/5693/1751/files/fivojitobumare.pdf
    • https://cdn.shopify.com/s/files/1/0439/1459/2408/files/jekedonebogijalugoj.pdf
    • https://cdn.shopify.com/s/files/1/0427/8845/4559/files/21848522869.pdf
    • https://cdn.shopify.com/s/files/1/0434/1514/2567/files/tv_guide_boise.pdf
    • https://cdn.shopify.com/s/files/1/0433/4374/1083/files/66792488390.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_off0000a2d4.bin
5bdb8b6c5e423d96307c9675b6ca785028fd396a2adc2dda8af373db8c2bd091		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA2D4 5200 bytes
font_01_sfnt_off0000b472.bin
58abbacfd88355f31b466e59652d03009bfc20787b7d90283b6891ca8aba074d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB472 10340 bytes

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