Malicious PDF — malware analysis report

Static analysis result for SHA-256 17410d125f25351a…

MALICIOUS

PDF

48.2 KB Created: 2020-07-29 09:46:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eec8b7e1d17684d5f72cdc1ed68ca68d SHA-1: e001f62b09cafef2d6bd6ffbffee1f26662bc7f5 SHA-256: 17410d125f25351a5967f2db3b0be0ce160a1b9b0b31a8d2fe3857ddb61f0d9c
154 Risk Score

Malware Insights

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

The PDF contains embedded links, with one pointing to a known malicious redirector. The document body, though heavily obfuscated, suggests a lure related to a 'date sheet'. The presence of numerous external PDF links, many hosted on Shopify, indicates a link farm strategy. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to redirect users to 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.cc/pify?keyword=du+sol+tentative+date+sheet+2019
    • http://files.andreawatkinslcsw.com/uploads/1/3/2/3/132302787/6752723.pdf
    • http://files.nursesnowinc.org/uploads/1/3/1/8/131856277/4821752.pdf
    • http://files.rideon365.com/uploads/1/3/1/8/131856956/mavomirej-ravawatufewo-tupotidaxu-livagirubowot.pdf
    • http://files.aexist.nl/uploads/1/3/0/7/130739631/5791864.pdf
    • http://files.bigvillagelittlecity.com/uploads/1/3/0/7/130739449/xemuj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/7199/5030/files/pakalupuje.pdf
    • https://cdn.shopify.com/s/files/1/0430/3329/7058/files/daduvajogesel.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/1028728638.pdf
    • https://cdn.shopify.com/s/files/1/0430/4971/3817/files/kimidedu.pdf
    • https://cdn.shopify.com/s/files/1/0440/7325/5062/files/tejawenulepakufused.pdf
    • https://cdn.shopify.com/s/files/1/0431/5725/8401/files/35629673589.pdf
    • https://cdn.shopify.com/s/files/1/0438/3273/7942/files/xosubasi.pdf
    • https://cdn.shopify.com/s/files/1/0431/4536/3610/files/jovipusobivapabedisaw.pdf
    • https://cdn.shopify.com/s/files/1/0431/7223/3376/files/jozata.pdf
    • https://cdn.shopify.com/s/files/1/0429/0933/5715/files/1622238736.pdf
    • https://cdn.shopify.com/s/files/1/0432/7034/0772/files/xugojumomajilin.pdf
    • https://cdn.shopify.com/s/files/1/0438/5390/6080/files/rosaxosubu.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_off00007313.bin
c0748187e821cc7d5d6a057347ffab39d2de8b3745bd49a7476e4d4304b28e3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7313 5240 bytes
font_01_sfnt_off000084e6.bin
bdc50ee14b59ce8ce8f01a2cc9b68cc244b731778572e6f2658a2197ffcae8f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84E6 15104 bytes

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