Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9b083a19d4a0d72…

MALICIOUS

PDF

44.3 KB Created: 2020-08-11 03:10:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 28044ef38d43a6e9617880360a917758 SHA-1: 29fd5de3b75f4183af397e3c13744eb7dea3d16b SHA-256: a9b083a19d4a0d72af6c0365bb9e44ee393b654793e4ff448a49346bae0fd346
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link that masquerades as a legitimate download. The ML classifier strongly indicates maliciousness, and the PDF structure includes numerous links, many pointing to Shopify domains, likely as part of an SEO-based link farm to obscure the malicious redirector. The primary malicious URL is ttraff.com, which is known for redirecting to malicious 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.com/pify?keyword=mathalino+strength+of+materials+pdf+download
    • http://files.shahsart.com/uploads/1/3/1/1/131163687/gagowipaverexuxax.pdf
    • http://files.babusci.com/uploads/1/3/2/6/132696063/3092237.pdf
    • http://files.thetravelingwriter.org/uploads/1/3/0/7/130738621/notuwiwarikoxesefov.pdf
    • https://cdn.shopify.com/s/files/1/0429/7624/7967/files/cracker_barrel_nutrition.pdf
    • https://cdn.shopify.com/s/files/1/0433/3826/8830/files/1351716849.pdf
    • https://cdn.shopify.com/s/files/1/0431/2141/0210/files/36263840362.pdf
    • https://cdn.shopify.com/s/files/1/0428/4927/1975/files/85051631592.pdf
    • https://cdn.shopify.com/s/files/1/0428/9354/1532/files/19051518840.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wugituvunajobi.pdf
    • https://cdn.shopify.com/s/files/1/0434/5449/6935/files/jazukalolilelavabu.pdf
    • https://cdn.shopify.com/s/files/1/0428/8184/3353/files/pawenugigekakafubir.pdf
    • https://cdn.shopify.com/s/files/1/0431/6240/2967/files/fisioterapia_cancer_de_pulmo.pdf
    • https://cdn.shopify.com/s/files/1/0440/9055/6568/files/38882431161.pdf
    • https://cdn.shopify.com/s/files/1/0434/5652/8537/files/guwuji.pdf
    • https://cdn.shopify.com/s/files/1/0432/9642/4096/files/33195010072.pdf
    • https://cdn.shopify.com/s/files/1/0436/0473/8206/files/kolowutiluluv.pdf
    • https://cdn.shopify.com/s/files/1/0434/6091/9461/files/87015374100.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005dde.bin
f3fdb2ed7faec5a2322e8e37ee22e825105cbc9c01fa5aa4e9bc0b8fa29540b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DDE 5340 bytes
font_01_sfnt_off00006fea.bin
ff6414f522bbb92865ac2e14f9cc31da75283995382f92dba9fcc462b0b2b7aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FEA 11224 bytes
font_02_sfnt_off00009594.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9594 4324 bytes

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