Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a581e9189fba533…

MALICIOUS

PDF

37.0 KB Created: 2020-08-21 23:13:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fcf5822d642957976157059f5be67903 SHA-1: 4d696fa787182febb252fcbe2b796038c7afc448 SHA-256: 2a581e9189fba533eb0c09713b922b8cecb4e3224529ac5cf28a31c7ffa734ac
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a mass of external links, with one prominent link pointing to a known malicious redirector at 'ttraff.ru'. The document body, though heavily obfuscated, contains text related to 'parabola conic sections worksheet' and the malicious URL, suggesting a lure to disguise the malicious intent. The ML classifier strongly flagged this PDF as malicious, and the heuristic firings indicate it's a link farm designed to redirect users to harmful content.

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=parabola+conic+sections+worksheet
    • http://files.jsklar.com/uploads/1/3/0/8/130814055/sinoxilavem_tijifujijeg.pdf
    • http://files.shorewoodculinaryarts.org/uploads/1/3/1/4/131406149/mobazibezevo.pdf
    • http://jiwisig.jeanpenny.com/uploads/1/3/1/1/131164250/e7c8ac017af7c.pdf
    • http://files.sanctuaries.org/uploads/1/3/1/8/131856443/jebegesogitesol.pdf
    • http://files.fiddleheadfoods.com/uploads/1/3/1/4/131437017/jinuwolejegi.pdf
    • https://cdn.shopify.com/s/files/1/0430/6151/0293/files/tofezoko.pdf
    • https://cdn.shopify.com/s/files/1/0436/4517/3910/files/bifeledosizisukegaxa.pdf
    • https://cdn.shopify.com/s/files/1/0430/4293/0842/files/bejujozutaxuzofef.pdf
    • https://cdn.shopify.com/s/files/1/0428/0477/3031/files/40557527745.pdf
    • https://cdn.shopify.com/s/files/1/0428/7981/1750/files/22220929924.pdf
    • https://cdn.shopify.com/s/files/1/0429/6838/3642/files/8511474090.pdf
    • https://cdn.shopify.com/s/files/1/0428/3331/3958/files/amiodarona_iv_bula.pdf
    • https://cdn.shopify.com/s/files/1/0431/8412/8151/files/sojelim.pdf
    • https://cdn.shopify.com/s/files/1/0429/8558/6841/files/stay_tuned_for_more_information.pdf
    • https://cdn.shopify.com/s/files/1/0427/6148/6503/files/tepadaloz.pdf
    • https://cdn.shopify.com/s/files/1/0430/1111/3123/files/vovafebulikipimikarafex.pdf
    • https://cdn.shopify.com/s/files/1/0429/1336/6182/files/tisebape.pdf
    • https://cdn.shopify.com/s/files/1/0428/1024/5279/files/pressure_washer_costco.pdf
    • https://cdn.shopify.com/s/files/1/0432/7964/6878/files/andersen_bajke.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_off000056c3.bin
99784be520eae7232b45a10721851f588dd68a455dbec3929b31dbbbad7875ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x56C3 5184 bytes
font_01_sfnt_off0000686b.bin
5fe23d05a781e79c6bd7bee39037bc28f5487b4571fdcbf805b1cd3ef7a00dee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x686B 8916 bytes

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