Malicious PDF — malware analysis report

Static analysis result for SHA-256 754b289f7ac07958…

MALICIOUS

PDF

58.7 KB Created: 2020-08-22 23:24:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 097356c1fdde179c862ab9a613743900 SHA-1: 9476a52448b9130a0c114a4b8bf783686acab13b SHA-256: 754b289f7ac079586318c96d031dd734555ba02bcdbe5bce299c2415d8d59f68
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though partially garbled, includes text related to a business letter template and the malicious URL. The ML classifier strongly indicated maliciousness, and the presence of a link farm heuristic suggests an attempt to manipulate search engine results or distribute content broadly. No scripts were extracted, but the embedded links are the primary vector for malicious activity.

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=heading+for+business+letter+template
    • http://kajaza.analisemcmanusphotography.com/uploads/1/3/1/6/131637056/9976894.pdf
    • http://files.glenoakscommunity.org/uploads/1/3/0/7/130738892/9772369.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0433/0940/0214/files/simavifavi.pdf
    • https://cdn.shopify.com/s/files/1/0436/9943/7721/files/action_replay_max_ps2.pdf
    • https://cdn.shopify.com/s/files/1/0432/7908/9824/files/37527793180.pdf
    • https://cdn.shopify.com/s/files/1/0433/8706/0375/files/12534170276.pdf
    • https://cdn.shopify.com/s/files/1/0433/7061/0851/files/wigavufefetumugowiritapit.pdf
    • https://cdn.shopify.com/s/files/1/0431/6102/6719/files/ejercicios_imperative_ingles.pdf
    • https://cdn.shopify.com/s/files/1/0434/3431/1845/files/81216886062.pdf
    • https://cdn.shopify.com/s/files/1/0464/1387/3320/files/arithmetic_reasoning_tricks.pdf
    • https://cdn.shopify.com/s/files/1/0444/2423/3126/files/rinidakapifegisameligidi.pdf
    • https://cdn.shopify.com/s/files/1/0434/1966/4542/files/ada_caries_risk_assessment_form_completion_instructions.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009a0e.bin
b04c8cffc2476ef02bb1a55a23951d8dd89b08acbf49ea60371e8f838c77b144		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A0E 5344 bytes
font_01_sfnt_off0000ac13.bin
dfc71ca442f404828ebb3975d514ade993ec7158a4cf42e189cd9c1522640020		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAC13 10648 bytes
font_02_sfnt_off0000d05d.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD05D 4324 bytes

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