Malicious PDF — malware analysis report

Static analysis result for SHA-256 656a90c4a0e030a0…

MALICIOUS

PDF

44.7 KB Created: 2020-08-12 05:57:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e5d0df8e1a3f1f081f292174e9955e44 SHA-1: f189664814bc47806a0f05c1d09af71e18358a1b SHA-256: 656a90c4a0e030a09f8cbde025eca83f544d25262693499baef260948f339059
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure at https://ttraff.cc/pify. The document body, though heavily obfuscated, contains this same URL, indicating an attempt to direct users to potentially harmful content. No scripts were extracted from this sample.

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.cc/pify?keyword=reading+comprehension+exercises+intermediate+level+pdf
    • http://files.wildchildfreeschool.org/uploads/1/3/1/6/131606965/rekufowesiketawe.pdf
    • http://loraxaf.sugardaddyscakedesign.com/uploads/1/3/2/8/132815367/nipanebebixi-zazenotorovi-pinugorivo.pdf
    • http://files.crowncharlotte.org/uploads/1/3/0/9/130969681/mewevan-wibuxamumabavok-dovexugibo.pdf
    • http://files.tregoningandco.com/uploads/1/3/1/3/131383763/6502853.pdf
    • http://files.wagincrc.com/uploads/1/3/2/6/132695278/2979268.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/3461/5706/files/55856042816.pdf
    • https://cdn.shopify.com/s/files/1/0434/0944/0933/files/togazozizewemitum.pdf
    • https://cdn.shopify.com/s/files/1/0434/7156/9046/files/dezelaraxe.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/7074967355.pdf
    • https://cdn.shopify.com/s/files/1/0436/9180/2777/files/vabaxarowusax.pdf
    • https://cdn.shopify.com/s/files/1/0431/5096/6950/files/51641782504.pdf
    • https://cdn.shopify.com/s/files/1/0431/9494/1603/files/2d_and_3d_shapes_properties.pdf
    • https://cdn.shopify.com/s/files/1/0435/9585/8088/files/78070160818.pdf
    • https://cdn.shopify.com/s/files/1/0437/3594/1274/files/85978937732.pdf
    • https://cdn.shopify.com/s/files/1/0430/2739/8807/files/13207331646.pdf
    • https://cdn.shopify.com/s/files/1/0433/2909/3784/files/80303666340.pdf
    • https://cdn.shopify.com/s/files/1/0437/0549/9801/files/79312018385.pdf
    • https://cdn.shopify.com/s/files/1/0428/0962/2691/files/patutaw.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/29878061118.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_off00006bf5.bin
75d1b0e570dbfee42481261f1d6657abfe1e35376a32d7eb25be27dacedad48f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BF5 5704 bytes
font_01_sfnt_off00007f42.bin
8257668a51f6eb791192b2f311e700a97ef4be50d6d545e2e5367f8777ac0560		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F42 11776 bytes

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