Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d994db8d115cce7…

MALICIOUS

PDF

48.3 KB Created: 2020-08-21 05:12:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 850fac9c70a7381347f0121c6100476e SHA-1: a3bbb4e55998656dd60383f93609eeabd356a53f SHA-256: 0d994db8d115cce713e50bdad8820fecfeb8a39720e926ed53e155a3c602693c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a "job delegation template" lure and embeds a large number of external links, many of which point to potentially malicious infrastructure. One critical heuristic identified a link to a known malicious redirector at `https://ttraff.com/pify?keyword=job+delegation+template`. The ML classifier also strongly flagged this PDF as malicious. The presence of numerous external links suggests an attempt to direct the user to malicious content or to engage in link farming.

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=job+delegation+template
    • http://files.monstahq.ca/uploads/1/3/0/8/130814432/e30838b9accfa1.pdf
    • http://lamaxi.wrangellsda.org/uploads/1/3/2/6/132683292/81d2d854a87886f.pdf
    • http://wavexo.shoprachellestx.com/uploads/1/3/0/7/130775507/2a927b43c9b6b82.pdf
    • http://files.maximilianlaw.com/uploads/1/3/0/8/130874361/jikawulijek.pdf
    • http://files.powerproductions.ca/uploads/1/3/1/4/131407445/7343177.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/1474/8322/files/pogebopobev.pdf
    • https://cdn.shopify.com/s/files/1/0432/9432/6939/files/fojiguzotexikebajali.pdf
    • https://cdn.shopify.com/s/files/1/0434/6704/7077/files/6650357310.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/negonarufefozosaburesid.pdf
    • https://cdn.shopify.com/s/files/1/0427/7361/0663/files/kaweges.pdf
    • https://cdn.shopify.com/s/files/1/0433/5501/3275/files/63912371313.pdf
    • https://cdn.shopify.com/s/files/1/0431/3710/6087/files/vlookup_function_with_different_sheets.pdf
    • https://cdn.shopify.com/s/files/1/0432/3049/4878/files/xerakifabe.pdf
    • https://cdn.shopify.com/s/files/1/0427/7728/0671/files/11654446407.pdf
    • https://cdn.shopify.com/s/files/1/0430/2965/9797/files/87902452867.pdf
    • https://cdn.shopify.com/s/files/1/0434/4384/7328/files/48224754998.pdf
    • https://cdn.shopify.com/s/files/1/0428/8849/5270/files/22302266953.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_off0000802a.bin
9888d40e24cbd2b5a1e2fc5645129a7c056539acbdc3f42d3bd9cae9c176d01b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x802A 5132 bytes
font_01_sfnt_off0000918b.bin
500c95be839251a706ad362483c2e56b8b26efa262cfdc26d5b00d01bef8f65d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x918B 10288 bytes

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