Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d4ee14d256bf1c1…

MALICIOUS

PDF

52.4 KB Created: 2020-09-10 11:50:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 285a1bba32b92b44c948857706593245 SHA-1: 5ad4dc792404e39b1b6b6873e6a8e3ad25d94950 SHA-256: 4d4ee14d256bf1c196d5ebea0070369447435426664b7ef75b04d99f56bba605
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded links, many of which point to external PDF files. One critical heuristic indicates that the PDF links to known malicious redirector infrastructure, specifically 'https://ttraff.link/pify?keyword=autoformation+windev+mobile+20'. Another heuristic flags it as a 'PDF_SEO_LINK_FARM', suggesting a tactic to artificially inflate search engine rankings or distribute malicious content through a large number of links. The ML classifier strongly supports the malicious verdict.

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.link/pify?keyword=autoformation+windev+mobile+20
    • http://files.denisenicoledesigns.com/uploads/1/3/1/3/131379680/8c72c.pdf
    • http://buvexole.hometechrenovations.ca/uploads/1/3/0/8/130874426/vidaposaxip-lobuvor-tasatak.pdf
    • http://files.tridenthabitat.org/uploads/1/3/1/4/131454190/mosawej.pdf
    • http://files.meridianbodycare.com/uploads/1/3/1/8/131857193/6976761.pdf
    • https://static.usrfiles.com/ugd/58a813_c42d9b1c40f3421285bf21e798f844d4.pdf
    • https://static.usrfiles.com/ugd/b81754_6032c0726fce4acb9a360cc37cf95081.pdf
    • https://static.usrfiles.com/ugd/dd4472_702c515879344b50b09ab4eea8ca7b6c.pdf
    • https://static.usrfiles.com/ugd/ed8107_3111946d6ba9497583dbecc5d474301a.pdf
    • https://static.usrfiles.com/ugd/9d869b_034c56f23f0f41c181281738b536719f.pdf
    • https://static.usrfiles.com/ugd/89064d_a7d7ddd764504c238d54304d1b3551ad.pdf
    • https://cdn.shopify.com/s/files/1/0450/8984/9509/files/jamb_biology_syllabus_download.pdf
    • https://cdn.shopify.com/s/files/1/0466/3869/4565/files/zubumibepotexewasivama.pdf
    • https://cdn.shopify.com/s/files/1/0432/7954/8580/files/suprapubic_catheter_care.pdf
    • https://cdn.shopify.com/s/files/1/0429/8221/1733/files/articles_of_confederation_worksheets_7th_grade.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/84860081798.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_off0000876d.bin
3786c965df74c43feba9cfbca31a04925deb6621c3c605fcad1054c8b126917e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x876D 5428 bytes
font_01_sfnt_off000099e2.bin
f93017e5979b8719c1ca5e677e4b029bb57e462fe62e32f6816f326529e6253d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x99E2 13712 bytes

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