Malicious PDF — malware analysis report

Static analysis result for SHA-256 0dd2221e742c5d99…

MALICIOUS

PDF

42.1 KB Created: 2020-08-10 14:54:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 08653e93e1c41e9be894af27645977f7 SHA-1: d843b01c2a9d7bc95dd51b04667f4cd6212559d1 SHA-256: 0dd2221e742c5d997ea29943359bf6283816cfc8792ec400bbb547fb2ad6bcb6
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.ru, which is designed to lead users to further malicious content. The document body, though heavily obfuscated, contains references to the redirector URL and numerous other PDF links, suggesting a link farm or SEO poisoning tactic. The ML classifier also strongly indicated maliciousness.

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=calculus+and+analytic+geometry+george+thomas+pdf
    • http://files.gstpchurch.org/uploads/1/3/0/7/130740138/kafudunevipobaw-junodikudutizi.pdf
    • http://zupopij.dallaswingdingers.com/uploads/1/3/1/8/131858661/8007649.pdf
    • http://files.expressyourselfiepb.com/uploads/1/3/1/3/131380337/2855440.pdf
    • http://zasuboz.neurology-u-tokyo.com/uploads/1/3/2/8/132815176/kawuzisobefojot.pdf
    • http://navaveki.betweenthebloom.com/uploads/1/3/1/4/131483337/2912762.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/8529/1937/files/76614174627.pdf
    • https://cdn.shopify.com/s/files/1/0430/7235/6513/files/70816743656.pdf
    • https://cdn.shopify.com/s/files/1/0434/4915/5740/files/75675761451.pdf
    • https://cdn.shopify.com/s/files/1/0428/4517/5971/files/yoga_for_height_increase.pdf
    • https://cdn.shopify.com/s/files/1/0438/9571/8040/files/hard_words_in_english_with_meaning.pdf
    • https://cdn.shopify.com/s/files/1/0433/6225/5006/files/automobile_engineering_basic_concepts.pdf
    • https://cdn.shopify.com/s/files/1/0431/0640/2453/files/traitement_de_l_infarctus_du_myocarde.pdf
    • https://cdn.shopify.com/s/files/1/0431/0879/4530/files/world_3_kancolle.pdf
    • https://cdn.shopify.com/s/files/1/0429/8558/6849/files/solovizotote.pdf
    • https://cdn.shopify.com/s/files/1/0429/9672/7962/files/72205727956.pdf
    • https://cdn.shopify.com/s/files/1/0432/0778/6654/files/rikagakunitozutelugewo.pdf
    • https://cdn.shopify.com/s/files/1/0432/2227/0114/files/candidiase_recorrente_tratamento.pdf
    • https://cdn.shopify.com/s/files/1/0432/7243/7913/files/15062326083.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vuvitew.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_off00006690.bin
5d7a95a0f625d484b4b2212aff5f8122e00018fa1361a6dd5e6a51350cd0a5bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6690 5576 bytes
font_01_sfnt_off0000795b.bin
4b5f2ce30ae8ac183b930c505c1af2368f3dd99c9c4c0b91abfd37dee2a31183		 pdf-font-stream PDF embedded font (sfnt) at offset 0x795B 9876 bytes

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