Malicious PDF — malware analysis report

Static analysis result for SHA-256 776991bd047a088a…

MALICIOUS

PDF

54.0 KB Created: 2020-08-24 05:07:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c4119af1ca5f7454093fd1b81a4bc795 SHA-1: d537ccb098ba8987d67f90200bb7d539692c1b18 SHA-256: 776991bd047a088a9c8d1546123895d5debd96355ccbaa4397806de9db0fa9cf
154 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, specifically a URL related to a 'cartier bracelet size guide' lure. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' confirms this, and the ML classifier strongly indicates maliciousness. The document body, though partially corrupted, contains references to the lure and the malicious URL, suggesting an attempt to trick users into clicking through to a compromised site.

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=cartier+bracelet+size+guide
    • http://pozab.carrsidesyndicate.com/uploads/1/3/1/3/131380213/7439543.pdf
    • http://files.imageupphotography.com/uploads/1/3/0/8/130873997/6439146.pdf
    • http://files.scottmassagetherapy.com/uploads/1/3/1/4/131452989/zaxapidelozuf-welojerifidulov-veminutal.pdf
    • http://files.loorg.org/uploads/1/3/1/6/131606253/talidivezukuva.pdf
    • http://files.whispersboutique.com/uploads/1/3/1/4/131438071/a847b8adbf6626.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/4293/8784/files/mexuv.pdf
    • https://cdn.shopify.com/s/files/1/0437/0969/4107/files/causes_of_greenhouse_effect.pdf
    • https://cdn.shopify.com/s/files/1/0432/9291/7924/files/1495983712.pdf
    • https://cdn.shopify.com/s/files/1/0437/0428/7383/files/86722379549.pdf
    • https://cdn.shopify.com/s/files/1/0434/0364/0993/files/94762331205.pdf
    • https://cdn.shopify.com/s/files/1/0430/7792/7063/files/87123320554.pdf
    • https://cdn.shopify.com/s/files/1/0433/4803/3689/files/70622942939.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/8861538602.pdf
    • https://cdn.shopify.com/s/files/1/0447/6128/4757/files/long_445_tractor.pdf
    • https://cdn.shopify.com/s/files/1/0439/1695/1704/files/59458585796.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_off00008a00.bin
b69c24ec459b0922ab7176d2a29bb72921d2de55ebd731f11676de79e61490a8
pdf-font-stream PDF embedded font (sfnt) at offset 0x8A00 5204 bytes
font_01_sfnt_off00009bb7.bin
c1eb604d2da9aa0402f8bdb7225def1de447631a5ea9e46d2f968ccc4c9aa162
pdf-font-stream PDF embedded font (sfnt) at offset 0x9BB7 15152 bytes