Malicious PDF — malware analysis report

Static analysis result for SHA-256 869372c25a12874c…

MALICIOUS

PDF

45.8 KB Created: 2020-08-16 12:59:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 60f5c47adaebcf211e90809f0209f088 SHA-1: 4ad854f60418dd40e5b991da440db52b19a97af9 SHA-256: 869372c25a12874cc1297fd3d1d20a7cb183078186ad5aac7c439513da849adc
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF document contains numerous embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains a URL that appears to be part of a link farm designed to distribute malicious content or phish users. The ML classifier strongly indicates maliciousness, and the presence of a redirector URL suggests an attempt to lead the user to a harmful site.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/wb?keyword=nucleic%20acids%20and%20protein%20synthesis%20worksheet
    • http://files.hisinscriptions.com/uploads/1/3/1/4/131483371/kizamovi-sodoxi-rijopasibexuzi.pdf
    • http://files.mouseandmeco.com.au/uploads/1/3/1/8/131872273/e6e3068229.pdf
    • http://mebovoz.mcmasterclimbingclub.com/uploads/1/3/0/8/130874359/tapur.pdf
    • http://files.twin-city.org/uploads/1/3/1/3/131378942/tidifu-zuwono-modagozixiwu-wifotob.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/1137/5267/files/bawawovakerodisefin.pdf
    • https://cdn.shopify.com/s/files/1/0435/7708/2019/files/balun_canan_completo.pdf
    • https://cdn.shopify.com/s/files/1/0435/4169/2580/files/fairy_tail_zero_episode_2.pdf
    • https://cdn.shopify.com/s/files/1/0435/7079/0558/files/metallica_back_to_the_front_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/3600/0931/files/bomorepedidu.pdf
    • https://cdn.shopify.com/s/files/1/0435/5971/4971/files/zesubosanarabixixijelebav.pdf
    • https://cdn.shopify.com/s/files/1/0430/7589/5450/files/58674249081.pdf
    • https://cdn.shopify.com/s/files/1/0429/0543/6326/files/jemajijofevepofunanegajij.pdf
    • https://cdn.shopify.com/s/files/1/0434/9070/5573/files/45465231437.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_off000074ba.bin
f5e754768b19fdff21ae1a3ee87bb61523b9caa88facc6dbdac252c6ef4be55c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74BA 5388 bytes
font_01_sfnt_off00008718.bin
181c6a185770f985eabdf1474bcbbbc59b7d11d236d829ac48935be871de983c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8718 10264 bytes

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