Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bc9aea28f9362e6…

MALICIOUS

PDF

41.7 KB Created: 2020-08-01 13:04:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 038df5825b2efb6c824ad779ab97e9d4 SHA-1: 520397b03cf8dbe09475c9d9fd2888fbf7a63d08 SHA-256: 6bc9aea28f9362e6925d9a6e47d76cb9ecb1ea9aa2084060e6e88cac97f8c58c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with one specifically identified as a redirector to known malicious infrastructure. The presence of numerous links to external PDFs hosted on Shopify suggests a link farm or SEO manipulation tactic. No scripts were extracted, and the document body was unreadable, but the link analysis strongly indicates 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=2018+%25D0%25B3%25D0%25BE%25D0%25B4+%25D0%25BA%25D0%25B0%25D0%25BA%25D0%25BE%25D0%25B3%25D0%25BE+%25D0%25B6%25D0%25B8%25D0%25B2%25D0%25BE%25D1%2582%25D0%25BD%25D0%25BE%25D0%25B3%25D0%25BE
    • http://files.board.solonchamber.com/uploads/1/3/0/7/130739152/1727025.pdf
    • http://files.killianhsmusic.com/uploads/1/3/2/7/132740536/nijekekanepasa_xuxevosijukok_lovilexedip.pdf
    • http://files.8citiesnb.com/uploads/1/3/0/7/130776230/1314321.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/1525/6738/files/laduzivusupabopar.pdf
    • https://cdn.shopify.com/s/files/1/0431/9592/4640/files/riwimadumafaxe.pdf
    • https://cdn.shopify.com/s/files/1/0438/5538/0645/files/16103688691.pdf
    • https://cdn.shopify.com/s/files/1/0431/3730/2679/files/79799031410.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nudukesobiji.pdf
    • https://cdn.shopify.com/s/files/1/0431/5529/2317/files/benikokeraj.pdf
    • https://cdn.shopify.com/s/files/1/0430/6645/8266/files/52305096160.pdf
    • https://cdn.shopify.com/s/files/1/0437/1991/7717/files/12080785612.pdf
    • https://cdn.shopify.com/s/files/1/0438/6154/1014/files/rukobawebovakita.pdf
    • https://cdn.shopify.com/s/files/1/0437/2617/6407/files/29895311483.pdf
    • https://cdn.shopify.com/s/files/1/0433/7054/5308/files/58440561207.pdf
    • https://cdn.shopify.com/s/files/1/0436/3033/0019/files/dawepiribegodaxu.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_off00005b46.bin
36b1f3d73fcd6e244ab28a21a4a6fbb79e4d3274bacf19dc42db8712a3f7c7e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B46 5584 bytes
font_01_sfnt_off00006e36.bin
c9f8bc9cf834c0e65238f70347e402dcc34a4e576530a2c8a15ae521ed61bce0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E36 13156 bytes

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