Malicious PDF — malware analysis report

Static analysis result for SHA-256 90f27bdc169c1f6c…

MALICIOUS

PDF

44.8 KB Created: 2020-08-05 07:25:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ceff466dfd310a7b31e3d8ec6d332b16 SHA-1: c98a7efe0cf8b4ffc6a37fa95a45331d04554f54 SHA-256: 90f27bdc169c1f6cca65a08f9ae20ea3269cfdeaba621ec604e841ed91c70d5b
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. The document body, though heavily obfuscated, contains text related to 'vetassess assessment guidelines pdf' and the malicious URL itself. The presence of numerous external PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to distribute the malicious PDF.

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=vetassess+assessment+guidelines+pdf
    • http://files.actionins.net/uploads/1/3/1/3/131379680/fd82ace24a8f700.pdf
    • http://files.countrylovelabradoodles.com/uploads/1/3/1/6/131607565/kapajiful.pdf
    • http://resav.birthvoice.com/uploads/1/3/0/8/130874197/4a837f90fc2147.pdf
    • http://files.rmbscenic.com/uploads/1/3/1/4/131483685/misaw-xesaxinekuxa-nikonozelemip-mipakat.pdf
    • https://cdn.shopify.com/s/files/1/0433/9433/4869/files/gojinuweza.pdf
    • https://cdn.shopify.com/s/files/1/0432/3554/1151/files/best_thesaurus_dictionary.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dusegu.pdf
    • https://cdn.shopify.com/s/files/1/0434/2385/8850/files/48320573104.pdf
    • https://cdn.shopify.com/s/files/1/0433/6576/1176/files/sumiwipawigamalatonima.pdf
    • https://cdn.shopify.com/s/files/1/0434/4207/7852/files/subnautica_table_coral_sample.pdf
    • https://cdn.shopify.com/s/files/1/0430/0688/6051/files/jixoj.pdf
    • https://cdn.shopify.com/s/files/1/0439/6823/3630/files/90370627551.pdf
    • https://cdn.shopify.com/s/files/1/0435/6459/7397/files/31768658097.pdf
    • https://cdn.shopify.com/s/files/1/0430/2651/4077/files/tikefatu.pdf
    • https://cdn.shopify.com/s/files/1/0439/1007/0440/files/pelvic_bone_anatomy.pdf
    • https://cdn.shopify.com/s/files/1/0440/7649/9096/files/is_it_illegal_to_use_frostwire.pdf
    • https://cdn.shopify.com/s/files/1/0431/4542/9160/files/wefozewikosiwevi.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_off000066d2.bin
da9d261782ac45e2e6b4f1ec0aa772a5cfd027bd6050952e7ae0a996bc54f32f
pdf-font-stream PDF embedded font (sfnt) at offset 0x66D2 5232 bytes
font_01_sfnt_off0000789b.bin
526998c5238d3d079b0d536c7fc09c8d06f64c32afa8bdbda01bb829735ccb5a
pdf-font-stream PDF embedded font (sfnt) at offset 0x789B 14028 bytes