Malicious PDF — malware analysis report

Static analysis result for SHA-256 87692a0dd54e99cb…

MALICIOUS

PDF

47.1 KB Created: 2020-08-10 21:10:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b9a8cc29c46bc5adcfa3184be2259165 SHA-1: fa8c26b79214d584709302976ff3299e3f2b6da1 SHA-256: 87692a0dd54e99cb55802576075f054c27b975a6bc2c5d6306299fd738011f19
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm designed to redirect users to malicious infrastructure, specifically identified by the heuristic PDF_MALICIOUS_REDIRECTOR_LINK. The document body, though corrupted, contains the URL https://ttraff.ru/pify?keyword=atomic+structure+notes+for+class+9+pdf, which is flagged as a malicious redirector. This indicates an attempt to lure users to a harmful site under the guise of providing educational 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=atomic+structure+notes+for+class+9+pdf
    • http://files.hjstudioraleigh.com/uploads/1/3/0/7/130776852/4767640.pdf
    • http://xedupexu.taylorbarrettphotography.com/uploads/1/3/0/8/130814328/a347128fc.pdf
    • http://files.complete-service-builds.com/uploads/1/3/1/4/131453623/b26951979dc6b.pdf
    • http://dudakomo.shorelineapics.org/uploads/1/3/1/4/131409090/2330255.pdf
    • http://files.accuratehomeinspections.ca/uploads/1/3/1/4/131453725/1061864.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/3192/8740/files/4979302310.pdf
    • https://cdn.shopify.com/s/files/1/0433/2745/5400/files/talidimakujonexixolo.pdf
    • https://cdn.shopify.com/s/files/1/0449/5346/9083/files/miller_and_levine_biology_textbook_teacher_s_edition.pdf
    • https://cdn.shopify.com/s/files/1/0433/4986/8712/files/design_of_mechanical_systems_book.pdf
    • https://cdn.shopify.com/s/files/1/0431/8802/7556/files/salvation_army_valuation_guide_2016.pdf
    • https://cdn.shopify.com/s/files/1/0429/5386/7427/files/newesilunorunaxow.pdf
    • https://cdn.shopify.com/s/files/1/0430/8126/9401/files/shoulder_bursitis_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0431/4326/6458/files/20062885603.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xuvoba.pdf
    • https://cdn.shopify.com/s/files/1/0434/0118/3397/files/87515396096.pdf
    • https://cdn.shopify.com/s/files/1/0430/4309/4677/files/85552304847.pdf
    • https://cdn.shopify.com/s/files/1/0435/8871/4653/files/2017_ram_1500_owners_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_off000078ea.bin
c9ab7a14d7d552d562f7811d502733a356b366ecc723cce34d225cc51f509eea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78EA 5448 bytes
font_01_sfnt_off00008b54.bin
2b3c65f6215679036bea191b536265132e2655696b759837425e509291caa2cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B54 10504 bytes

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