Malicious PDF — malware analysis report

Static analysis result for SHA-256 717389a1a0c2147a…

MALICIOUS

PDF

53.1 KB Created: 2020-08-18 17:19:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bc7f8898358842fc4b7b17b4ff938ca8 SHA-1: e06d1f58416c181a454a708707de1ecd9e3e6a51 SHA-256: 717389a1a0c2147a185fa3c497930534471fa4558037a2d343d14d00ed932a15
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting a tactic to manipulate search engine results or distribute further malicious content. The ML classifier also strongly flagged this PDF as malicious.

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.com/pify?keyword=anthony+daasan+songs++isaimini
    • http://saturux.ewrcarter.co.uk/uploads/1/3/0/9/130969723/115847.pdf
    • http://files.kasiaclarke.com/uploads/1/3/1/4/131406669/0b727605.pdf
    • http://files.gunnersquillshedgehogs.com/uploads/1/3/1/4/131407552/3d79071f4d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/0579/6774/files/lofodalakutunafosegop.pdf
    • https://cdn.shopify.com/s/files/1/0430/4565/0586/files/32330707271.pdf
    • https://cdn.shopify.com/s/files/1/0429/7241/4106/files/50285384383.pdf
    • https://cdn.shopify.com/s/files/1/0433/1234/9334/files/ruzupunetova.pdf
    • https://cdn.shopify.com/s/files/1/0436/2164/6498/files/guitar_barre_chords_chart.pdf
    • https://cdn.shopify.com/s/files/1/0430/8716/7649/files/example_of_mean_median_mode_in_statistics.pdf
    • https://cdn.shopify.com/s/files/1/0429/3640/2079/files/87977300064.pdf
    • https://cdn.shopify.com/s/files/1/0433/4724/7263/files/2020_buick_regal_repair_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_off0000855b.bin
2ccaa6c3a0455a22ea488354739a09952a28dd2c83a8b31da94f40e7181d550d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x855B 5200 bytes
font_01_sfnt_off000096ea.bin
e440175050391231bdfe230eae65b3ff02ae976ae39a027211756c516a72e99b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x96EA 15972 bytes

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