Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a2ccced795832b2…

MALICIOUS

PDF

52.1 KB Created: 2020-07-28 10:43:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eb5cfa2409a6b4dc5214dfa8e9760114 SHA-1: 7e071f1337a6f7b45ed31a91f02e47ae184e414c SHA-256: 5a2ccced795832b27c7f5bd91fe94226201922854d582a3f77ca88ce180c1fed
154 Risk Score

Malware Insights

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

The PDF contains numerous links, with one critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, suggests a lure related to financial templates. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content.

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=balance+sheet+template+assets+liabilities
    • http://files.prhscheerlions.com/uploads/1/3/2/7/132740423/dulogaja.pdf
    • http://files.krisjezakart.com/uploads/1/3/0/7/130776646/3219020.pdf
    • http://files.freedomoftheoppressed.us/uploads/1/3/1/4/131407818/3864032.pdf
    • http://files.herewoodsart.co.uk/uploads/1/3/2/6/132681045/xomikuf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/2083/6254/files/jekegabakadarinebu.pdf
    • https://cdn.shopify.com/s/files/1/0432/5661/0979/files/72397171300.pdf
    • https://cdn.shopify.com/s/files/1/0436/9544/0040/files/nanavunafifow.pdf
    • https://cdn.shopify.com/s/files/1/0430/7373/2768/files/wopimunorovexukolibemu.pdf
    • https://cdn.shopify.com/s/files/1/0432/6565/4939/files/54642044343.pdf
    • https://cdn.shopify.com/s/files/1/0428/4655/2230/files/wagiregusegiselixosijek.pdf
    • https://cdn.shopify.com/s/files/1/0431/7564/1247/files/98011766667.pdf
    • https://cdn.shopify.com/s/files/1/0431/4418/3970/files/55613740849.pdf
    • https://cdn.shopify.com/s/files/1/0430/6858/8194/files/dududabezegupa.pdf
    • https://cdn.shopify.com/s/files/1/0433/2807/7992/files/85555434467.pdf
    • https://cdn.shopify.com/s/files/1/0438/4748/3552/files/bodetiwegitapivado.pdf
    • https://cdn.shopify.com/s/files/1/0434/6055/9013/files/97987163182.pdf
    • https://cdn.shopify.com/s/files/1/0431/0591/0933/files/bugewakesininebirebuposi.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_off00008d90.bin
0ea9647634be477b7935ee3ba79d6dec2c7b0074f9bb3ec7475a6e2223f96364		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D90 4944 bytes
font_01_sfnt_off00009e1e.bin
4e907e50bbc012865b13d660a35bbb46931981525af017f79d63f1e626543b47		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9E1E 11012 bytes

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