Malicious PDF — malware analysis report

Static analysis result for SHA-256 13e3323fdc2ea32d…

MALICIOUS

PDF

47.6 KB Created: 2020-08-15 02:23:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 91d3e1155193968f0309b7e32a5e7f7d SHA-1: 3428162723ea2fd80199c24aa99ebb76a88b6fd8 SHA-256: 13e3323fdc2ea32da40902b3ff98bdd1491b1161cad2fa247ac61959a15926f1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on various domains, suggesting a link farm or SEO poisoning tactic. One of the embedded URLs, 'https://ttraff.cc/pify?keyword=factoid+question+answering+dataset', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to the malicious URL and other PDF links.

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=factoid+question+answering+dataset
    • http://files.annarbormothertree.com/uploads/1/3/1/4/131483138/e350c3.pdf
    • http://files.taylormccarey.com/uploads/1/3/1/6/131636602/bakisejuwul_satasemomixo.pdf
    • http://files.yosoysantialva.com/uploads/1/3/0/9/130969306/rofapanajozadipamis.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/4003/8298/files/labibibakamizuxogi.pdf
    • https://cdn.shopify.com/s/files/1/0437/9338/3585/files/58210972413.pdf
    • https://cdn.shopify.com/s/files/1/0433/6815/3253/files/98798980203.pdf
    • https://cdn.shopify.com/s/files/1/0440/4117/5190/files/gemobexigodigafoxifamuz.pdf
    • https://cdn.shopify.com/s/files/1/0436/0211/6772/files/zotusowemuxijegebalexorun.pdf
    • https://cdn.shopify.com/s/files/1/0437/7359/1703/files/pazesiju.pdf
    • https://cdn.shopify.com/s/files/1/0432/8649/5396/files/2954192733.pdf
    • https://cdn.shopify.com/s/files/1/0431/1724/8672/files/lexejifajimejimafofi.pdf
    • https://cdn.shopify.com/s/files/1/0431/2485/0842/files/vejibugefebosutug.pdf
    • https://cdn.shopify.com/s/files/1/0429/7100/5082/files/pro_style_fantasies.pdf
    • https://cdn.shopify.com/s/files/1/0436/4189/7110/files/big_bang_theory_roommate_agreement_download.pdf
    • https://cdn.shopify.com/s/files/1/0439/0689/1931/files/asterisk_13_documentation.pdf
    • https://cdn.shopify.com/s/files/1/0427/6997/3415/files/general_awareness_aptitude_questions_answers.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_off00007bea.bin
442712e71acba91eea7db9fb763790821c41af36a432b6de7045f8f74a2345df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BEA 5248 bytes
font_01_sfnt_off00008dd4.bin
b3f2d1aa5973548379e1a4103662b866de0a6c0b47bb65ae01fcb89aeae782df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8DD4 10516 bytes

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