Malicious PDF — malware analysis report

Static analysis result for SHA-256 a709e15fe4be7a6b…

MALICIOUS

PDF

41.8 KB Created: 2020-08-11 07:11:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9ac8092a946ee2f369491f3fb4023263 SHA-1: fc73ecea051ccd1c54744318be070f36f6adbdff SHA-256: a709e15fe4be7a6ba72faffa69e8a8db599f843d92f1ab2e8de2c1efd0f999de
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text suggesting it is an 'aptitude test sample questions pdf', aligning with the malicious redirector's keyword. The presence of a large number of external PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to distribute the malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=aptitude+test+sample+questions+pdf
    • http://sajikit.crystalstutoring.com/uploads/1/3/0/8/130814124/ropulawujaga-gavet-gogok-kewajuximof.pdf
    • http://files.tranbcreative.com/uploads/1/3/2/7/132710711/f525eb49193.pdf
    • http://volebeg.nvwesleyan.com/uploads/1/3/1/3/131381518/pokunikaxeva-pikixozigugu.pdf
    • https://cdn.shopify.com/s/files/1/0434/7602/5510/files/4035802755.pdf
    • https://cdn.shopify.com/s/files/1/0435/6974/1983/files/download_biblia_takatifu_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0434/2366/2236/files/98490918612.pdf
    • https://cdn.shopify.com/s/files/1/0432/8413/6086/files/20156463209.pdf
    • https://cdn.shopify.com/s/files/1/0435/7206/8520/files/32540414913.pdf
    • https://cdn.shopify.com/s/files/1/0437/2103/1832/files/oathbound_paladin_build.pdf
    • https://cdn.shopify.com/s/files/1/0434/1579/7917/files/tawosivoxuje.pdf
    • https://cdn.shopify.com/s/files/1/0430/7327/4018/files/86538019012.pdf
    • https://cdn.shopify.com/s/files/1/0430/4257/0402/files/94028523656.pdf
    • https://cdn.shopify.com/s/files/1/0433/6818/6015/files/orgb_5th_edition_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/3250/1656/files/four_personality_types.pdf
    • https://cdn.shopify.com/s/files/1/0431/2875/0234/files/lefumezewezu.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000064e8.bin
349d58850643274e6099f4703104717179296184ed9b6e6969b7199c8f0b412c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64E8 5208 bytes
font_01_sfnt_off0000768c.bin
76856858947fd8f328b5a52993480358efab5d966a15e7e119cfd9f3e170d270		 pdf-font-stream PDF embedded font (sfnt) at offset 0x768C 10588 bytes

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