Malicious PDF — malware analysis report

Static analysis result for SHA-256 031203b2563bd3c1…

MALICIOUS

PDF

71.5 KB Created: 2020-08-05 04:46:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 10cf5deb99e91bd30ef4acdc48e3feb0 SHA-1: aed23869ed7867d392ba615307759c73e700ef58 SHA-256: 031203b2563bd3c1e2cf23d01dccf931708b8e077719a96954f029d21c73fa07
162 Risk Score

Malware Insights

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

The PDF contains a lure related to auditor responsibilities and embeds numerous links, including one pointing to a known malicious redirector. The ML classifier strongly indicates maliciousness, and the document body itself contains the malicious URL. This suggests the document is designed to trick users into visiting malicious infrastructure, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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=rights+duties+and+liabilities+of+auditors+pdf
    • http://files.ashraeli.com/uploads/1/3/1/4/131406478/4674537.pdf
    • http://files.tricendecokithomes.com.au/uploads/1/3/1/6/131637257/digisojizaxigej_lezedimeg.pdf
    • http://files.yahshigul.com/uploads/1/3/0/7/130739783/wabus.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0429/2778/4099/files/35368695575.pdf
    • https://cdn.shopify.com/s/files/1/0435/2815/9381/files/togisofaripawak.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/85286147205.pdf
    • https://cdn.shopify.com/s/files/1/0437/1546/1275/files/badug.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zukax.pdf
    • https://cdn.shopify.com/s/files/1/0430/6193/6282/files/80100681077.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/89120683065.pdf
    • https://cdn.shopify.com/s/files/1/0428/2423/7212/files/31436709130.pdf
    • https://cdn.shopify.com/s/files/1/0428/8203/9964/files/37339025982.pdf
    • https://cdn.shopify.com/s/files/1/0437/6123/8168/files/82202793434.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wexidemunuviviradepinitim.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd4c.bin
fe28a53011ff0abb61a21638b7eb8ee29b86c39581378a3db48223f1624e76a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD4C 5332 bytes
font_01_sfnt_off0000df5a.bin
5505412aa85b36a173d9c19aa32ee902f50106c181a1b879eeceba5c08ad29b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5A 10272 bytes
font_02_sfnt_off0001026b.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1026B 4324 bytes

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