Malicious PDF — malware analysis report

Static analysis result for SHA-256 99760b1f53064572…

MALICIOUS

PDF

49.8 KB Created: 2020-08-08 03:28:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e2bcc635dc5c975b9da68b58c0c0ef6a SHA-1: 2883bdf4d1bd2e499a9568f7075dfe5847846d18 SHA-256: 99760b1f530645722db9571ac4f25d8791b9c857dc3d2ea12d3a0a97bae3e9fe
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a mass external link farm, with a critical heuristic firing for a malicious redirector link. The primary malicious URL identified is https://ttraff.cc/pify?keyword=definition+of+job+analysis+pdf, which is designed to redirect users to other sites. The document body, though heavily obfuscated, contains keywords related to job analysis and the PDF creation tool, suggesting a lure to disguise the malicious intent. The ML classifier strongly supports the malicious nature of this PDF.

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=definition+of+job+analysis+pdf
    • http://files.palaceproductioncenter.com/uploads/1/3/1/3/131380842/bb5b9131.pdf
    • http://files.rochonsands.net/uploads/1/3/0/8/130814055/0863beefb8e3e9.pdf
    • http://ridigasi.opensideup.com/uploads/1/3/2/6/132681352/gokazi-ratitewofub-xewuludeze-joxexotumitet.pdf
    • http://resegi.brightonfd.com/uploads/1/3/0/9/130969754/b6b7e56.pdf
    • https://cdn.shopify.com/s/files/1/0454/7497/1798/files/canon_lide_300_multiple_page.pdf
    • https://cdn.shopify.com/s/files/1/0433/3764/6245/files/xuxebajamaxojaduv.pdf
    • https://cdn.shopify.com/s/files/1/0431/5473/5264/files/landscape_architecture_projects.pdf
    • https://cdn.shopify.com/s/files/1/0431/8917/4432/files/18677678254.pdf
    • https://cdn.shopify.com/s/files/1/0438/1304/4386/files/alphonso_dunn_pen_and_ink.pdf
    • https://cdn.shopify.com/s/files/1/0433/2313/0009/files/zizufovejenuxotenerujuz.pdf
    • https://cdn.shopify.com/s/files/1/0437/5992/7448/files/89076953687.pdf
    • https://cdn.shopify.com/s/files/1/0430/6790/0061/files/event_planning_budget.pdf
    • https://cdn.shopify.com/s/files/1/0431/4162/8072/files/76425540718.pdf
    • https://cdn.shopify.com/s/files/1/0427/8029/5334/files/ravafupapubifer.pdf
    • https://cdn.shopify.com/s/files/1/0435/3864/5144/files/pigezigisewivezami.pdf
    • https://cdn.shopify.com/s/files/1/0437/6874/2040/files/zaxasejusojovilifenugeja.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000082af.bin
46ffa7ecf97faef72e91ded356457d860ade71b97d671456f83fa1ada5e3b5be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82AF 5256 bytes
font_01_sfnt_off000094b5.bin
c2fae1c3744202e64a6e50107c46cbe5d1fedae94cfa45814f6a52bff8d2b1d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x94B5 11024 bytes

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