Malicious PDF — malware analysis report

Static analysis result for SHA-256 88f706bf2354fcaa…

MALICIOUS

PDF

42.6 KB Created: 2020-08-06 11:38:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aab18dd44243921ed2d53a3e440dfe75 SHA-1: f363f6dd51c23212999bc476d51e34069533f2ff SHA-256: 88f706bf2354fcaa90034467a261a0b5230250a99a0fbb30aa7864adc82a884d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which point to a link farm designed to redirect users to malicious infrastructure. The primary malicious URL identified is ttraff.ru, which is flagged as a known malicious redirector. The document body, though heavily obfuscated, contains references to the malicious URL and other PDF links, suggesting a phishing or scam attempt.

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/wb?keyword=organizational%20citizenship%20behavior%20scale%20pdf
    • http://files.luzcarmenboutique.com/uploads/1/3/1/4/131437750/tijenoropabesi_zavikupa_zitabuzegu_vajenud.pdf
    • http://files.deefacepaint.com/uploads/1/3/2/7/132741322/muxojako-patur-bagejusadube.pdf
    • http://ruruwusax.justbittenfishingtackle.com/uploads/1/3/2/7/132740435/xupokof.pdf
    • http://files.cottondownsouth.com/uploads/1/3/1/4/131437593/68f5e82128.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/7361/8599/files/tijawekefaxevufuku.pdf
    • https://cdn.shopify.com/s/files/1/0431/0463/2992/files/enteral_administration_of_medications.pdf
    • https://cdn.shopify.com/s/files/1/0430/0088/9507/files/vapeximukotowisuxojawof.pdf
    • https://cdn.shopify.com/s/files/1/0429/2784/9639/files/85055241713.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/23651487672.pdf
    • https://cdn.shopify.com/s/files/1/0430/4433/9861/files/sobapepodisagowobukezurun.pdf
    • https://cdn.shopify.com/s/files/1/0431/0014/3770/files/fender_rumble_150.pdf
    • https://cdn.shopify.com/s/files/1/0429/0756/6239/files/58540172426.pdf
    • https://cdn.shopify.com/s/files/1/0433/0238/7867/files/63331093505.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/rikujolam.pdf
    • https://cdn.shopify.com/s/files/1/0435/7164/2527/files/96709791883.pdf
    • https://cdn.shopify.com/s/files/1/0436/9947/0486/files/36937646710.pdf
    • https://cdn.shopify.com/s/files/1/0435/8710/9023/files/fakagasulajar.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/97253363073.pdf
    • https://cdn.shopify.com/s/files/1/0438/0796/5341/files/bisugijefesoxemal.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_off000064f5.bin
347b6150f8b0ff64a8991ace0d758bb606ed4af238918ba50c8d87f54dbdc310		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64F5 5692 bytes
font_01_sfnt_off0000785b.bin
faf06e5ef2d09e7c5baf608aa84a9c0b7817d4f1a44f3af38d7863d2aea1f4da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x785B 10656 bytes

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