Malicious PDF — malware analysis report

Static analysis result for SHA-256 173fe5dc3db07ced…

MALICIOUS

PDF

50.7 KB Created: 2020-08-03 07:24:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: af91b30888217ce6b43d2538991c33a6 SHA-1: 984fffa4292ff177305994c514ddde50240dc97a SHA-256: 173fe5dc3db07cede0779949aeaba29c3a6359e7239bf695f03123b13832fbc0
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify URLs that appear to be disguised as legitimate worksheets. One critical heuristic identified a link to a known malicious redirector, ttraff.com, which is likely used to obscure the final malicious destination. The document body, though heavily obfuscated, contains text related to counting days and a URL that matches the redirector, suggesting a phishing or malware distribution lure.

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=count+number+of+days
    • http://files.tjhscounseling.com/uploads/1/3/0/9/130969389/012f923f.pdf
    • http://files.horrorscoops.com/uploads/1/3/1/4/131453213/tatokoz.pdf
    • http://files.cedargrovewindyhillfarm.com/uploads/1/3/2/6/132696285/889447.pdf
    • http://files.wisdomboulevard.com/uploads/1/3/0/7/130775959/06e37366527997.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/6815/4278/files/nursing_dosage_calculation_practice_worksheets_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0435/1950/8634/files/27986412427.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xizijifopaxefiz.pdf
    • https://cdn.shopify.com/s/files/1/0430/5436/6877/files/64005047991.pdf
    • https://cdn.shopify.com/s/files/1/0434/3991/5164/files/92148778445.pdf
    • https://cdn.shopify.com/s/files/1/0429/8784/7843/files/viwif.pdf
    • https://cdn.shopify.com/s/files/1/0434/5040/0920/files/880410458.pdf
    • https://cdn.shopify.com/s/files/1/0430/2657/9610/files/88558910576.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/84113106953.pdf
    • https://cdn.shopify.com/s/files/1/0433/8217/7946/files/87733044678.pdf
    • https://cdn.shopify.com/s/files/1/0434/0934/2621/files/kesefejujovivujapolevilo.pdf
    • https://cdn.shopify.com/s/files/1/0430/2887/3367/files/vijuxad.pdf
    • https://cdn.shopify.com/s/files/1/0427/6515/6508/files/tanogakibuzebubudavibuk.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_off000089b5.bin
f65741139d244fe7cbce03570cdb8efc85a21f953626b7eeef2e9c96da86ccef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89B5 5168 bytes
font_01_sfnt_off00009b2d.bin
b24ef6894571571e0a7fc5bc78b64a6fa9513033eb249786f1837c462483e3d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B2D 10184 bytes

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