Malicious PDF — malware analysis report

Static analysis result for SHA-256 14ba190956b85fbf…

MALICIOUS

PDF

38.9 KB Created: 2020-08-18 17:21:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1257cdf4631b1d6345026d4c7daa0d61 SHA-1: c63024a312b9e00d76a2cc340f344b30ae0f2da9 SHA-256: 14ba190956b85fbf011dd091e4ac622dbfc8a6a5bed8bc34885fc65b8ae48b6b
154 Risk Score

Malware Insights

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

The PDF contains a lure text suggesting a job offer rejection, but embeds multiple links, one of which, 'https://ttraff.ru/pify?keyword=rejection+letter+job+offer+template', is flagged as a malicious redirector. The presence of numerous external PDF links, including one to a Shopify domain, suggests a link farm or redirection tactic. While no scripts were explicitly extracted, the PDF structure and embedded links indicate an attempt to redirect the user to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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=rejection+letter+job+offer+template
    • http://files.21centurycheer.com/uploads/1/3/2/8/132815004/negupufegasafap.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/8937/9993/files/team_extreme_minecraft.pdf
    • https://cdn.shopify.com/s/files/1/0434/7474/7545/files/isometric_grid_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/7093/9541/files/20779352371.pdf
    • https://cdn.shopify.com/s/files/1/0432/8531/5737/files/financial_reporting_standards_new_zealand.pdf
    • https://cdn.shopify.com/s/files/1/0431/6649/8965/files/gesefedo.pdf
    • https://cdn.shopify.com/s/files/1/0428/7892/7014/files/bukij.pdf
    • https://cdn.shopify.com/s/files/1/0441/1644/3288/files/dispositivos_de_almacenamiento_definicion.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_off00005b16.bin
f50ee5e217963a9a4ba963c370fa0cbc0ccd06a26f53971f4f99c39b878e64a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B16 5204 bytes
font_01_sfnt_off00006cac.bin
4318f2ddf8ec5177f51560455a3a4bac917d0e21ececc8f24df2a9af11bf053a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CAC 10100 bytes

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