Malicious PDF — malware analysis report

Static analysis result for SHA-256 8635d5e15937135b…

MALICIOUS

PDF

41.1 KB Created: 2020-08-30 20:31:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3dd2fe20c488dec3210c282cce6ca12f SHA-1: 7fc711d36ceac5705a8e57c4242163d54b154cdc SHA-256: 8635d5e15937135b9ba95aa76bfd00daa8567819b8474b3c5ed771f107f7625b
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 infrastructure, indicating an attempt to lure the user to a harmful destination. The document also features a large number of external PDF links, many hosted on Shopify, suggesting a link farm or SEO manipulation tactic. While no scripts were extracted, the presence of a malicious redirector and the ML classifier's high confidence score point towards a malicious intent, likely related to phishing or malware delivery.

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/wix?keyword=oltremare+einaudi+sheet+music
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/1423/4016/files/zasevajirakumafevosik.pdf
    • https://cdn.shopify.com/s/files/1/0433/1687/1326/files/sepabuzikodowo.pdf
    • https://cdn.shopify.com/s/files/1/0434/5928/1061/files/atp_tennis_schedule_2020.pdf
    • https://cdn.shopify.com/s/files/1/0440/1260/1502/files/41865142218.pdf
    • https://cdn.shopify.com/s/files/1/0433/4678/8502/files/vuvotegujaxoxapuvixevili.pdf
    • https://cdn.shopify.com/s/files/1/0434/7432/1560/files/vaxakivimobizijepenoweluw.pdf
    • https://cdn.shopify.com/s/files/1/0432/7024/2460/files/onan_5500_generator_service_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/7877/0078/files/talisuwo.pdf
    • https://cdn.shopify.com/s/files/1/0432/8708/5222/files/expenses_voucher_format.pdf
    • https://static.usrfiles.com/ugd/f09a9d_457941ae26a9409197be68c24ac728f5.pdf
    • https://static.usrfiles.com/ugd/b8c837_a86d91661e1c4b0799e907e1ff31fb36.pdf
    • https://static.usrfiles.com/ugd/d5415a_3b390feb0f6f4e6094f942cb1ef986d3.pdf
    • https://static.usrfiles.com/ugd/33a2e4_e281ac5c46d3476b97792ed955f14174.pdf
    • https://static.usrfiles.com/ugd/b8c837_9ff37e4a526f42fd805e670bfd6c74ac.pdf
    • https://cdn.shopify.com/s/files/1/0438/2215/3890/files/3312365857.pdf
    • https://cdn.shopify.com/s/files/1/0431/1266/1152/files/mikamizoduwu.pdf
    • https://cdn.shopify.com/s/files/1/0432/3626/2052/files/dungeons_and_dragons_4e_monster_manual.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_off00005417.bin
39bf728b4c6a57c9cd9e91ff00f6db3bbcb157fa8fe6593bae2d24fec441008f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5417 5208 bytes
font_01_sfnt_off0000658c.bin
aa1c68c7b6c3cbeb984fdf9096e209965b0db09a04aeb22104aa804680276af9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x658C 15748 bytes

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