Malicious PDF — malware analysis report

Static analysis result for SHA-256 781234feafa1a178…

MALICIOUS

PDF

43.0 KB Created: 2020-08-23 07:33:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5b10531612e46c91fe1ee263687d0028 SHA-1: 40bda1da451ff2e2179f525765f9a5ae68237efe SHA-256: 781234feafa1a178ada8a3fd3f6c35b7c280c25307630cb9c3c382b1c518420f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a heuristic firing for malicious redirector links, specifically pointing to 'ttraff.ru'. The document body, though heavily obfuscated, contains the same URL and a reference to a movie, suggesting a lure. The PDF also contains a large number of links to other PDFs, indicating a link farm, with the primary link pointing to a Shopify domain. The ML classifier also strongly indicated maliciousness.

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=good+luck+chuck+full+movie+free
    • http://files.tracyeducatorsassociation.org/uploads/1/3/1/4/131453934/4428832.pdf
    • http://files.craigheadresearch.org/uploads/1/3/1/1/131163872/daea11.pdf
    • http://files.christanglicanfellowship.org/uploads/1/3/1/4/131406082/nemekarinudi-pilija-rolizuxa.pdf
    • http://bumumupag.savemartlascruces.com/uploads/1/3/1/8/131871721/2741918.pdf
    • http://files.canwemummy.com/uploads/1/3/0/7/130740049/8432118.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/doworefobose.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/40573574370.pdf
    • https://cdn.shopify.com/s/files/1/0429/2182/0313/files/71941437889.pdf
    • https://cdn.shopify.com/s/files/1/0429/3692/6374/files/blender_2._8_modeling.pdf
    • https://cdn.shopify.com/s/files/1/0434/9270/4408/files/89955413564.pdf
    • https://cdn.shopify.com/s/files/1/0429/9181/2771/files/47333701747.pdf
    • https://cdn.shopify.com/s/files/1/0430/1560/2339/files/rebapedezed.pdf
    • https://cdn.shopify.com/s/files/1/0437/6500/6494/files/fao_evapotranspiration.pdf
    • https://cdn.shopify.com/s/files/1/0438/6829/1227/files/3d_to_stl_converter_online.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/18491093394.pdf
    • https://cdn.shopify.com/s/files/1/0431/7305/2575/files/exceptional_c_style_github.pdf
    • https://cdn.shopify.com/s/files/1/0437/1978/6645/files/xomitegut.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_off000069fe.bin
144c7a1d954bcce4ce8804ca2e75c788424db573a3ce2ffc9f9934e1e8fac0f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69FE 5028 bytes
font_01_sfnt_off00007afa.bin
bd73064647b713b5cf03d32279c0212a514bd140e4fc2c762276f2f6c9d29397		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AFA 10380 bytes

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