Malicious PDF — malware analysis report

Static analysis result for SHA-256 09d32f49ccfb8d7b…

MALICIOUS

PDF

50.5 KB Created: 2020-08-07 16:14:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f7fbefd4dc79afb5f5935284a88ffc88 SHA-1: fde4a49a7110c95909ab7ee9e9a01e6f83fd3ad0 SHA-256: 09d32f49ccfb8d7be7de50061cb4496b85cc094f93c94b4205dcda7aaac44640
154 Risk Score

Malware Insights

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

The PDF contains embedded links, with one prominent URL leading to a known malicious redirector. The document body, though heavily obfuscated, contains the same malicious URL. This suggests the file is designed to redirect users to malicious infrastructure, likely for further exploitation or phishing. No scripts were extracted, but the presence of embedded URLs and the ML classifier's high confidence indicate malicious intent.

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=thyristor+circuits+pdf
    • http://files.ayumialdina.com/uploads/1/3/1/4/131406140/5218818.pdf
    • http://files.tacomateasandherbs.com/uploads/1/3/0/7/130740257/2977954.pdf
    • http://pedove.aspiraconsultancy.com/uploads/1/3/0/7/130739415/36b8e043e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/4567/5420/files/2719968271.pdf
    • https://cdn.shopify.com/s/files/1/0437/0841/6165/files/brasserie_star_madagascar.pdf
    • https://cdn.shopify.com/s/files/1/0429/7526/4924/files/52836358973.pdf
    • https://cdn.shopify.com/s/files/1/0434/3080/5669/files/40223489445.pdf
    • https://cdn.shopify.com/s/files/1/0429/5809/4495/files/11257236299.pdf
    • https://cdn.shopify.com/s/files/1/0437/6847/9893/files/79597013926.pdf
    • https://cdn.shopify.com/s/files/1/0430/1615/9381/files/lunebigisatokuwubimazize.pdf
    • https://cdn.shopify.com/s/files/1/0431/1266/1152/files/rovizexumafokojagus.pdf
    • https://cdn.shopify.com/s/files/1/0430/6747/4087/files/84574603145.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/3215656586.pdf
    • https://cdn.shopify.com/s/files/1/0432/9927/4916/files/20418404966.pdf
    • https://cdn.shopify.com/s/files/1/0431/6053/5196/files/admin_officer_interview_questions_and_answers.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_off000088ce.bin
a7e868abc1bf29c9d3b8e93e6e57900ad586a46d0d2a2e20299283f6a3bf14bc
pdf-font-stream PDF embedded font (sfnt) at offset 0x88CE 5052 bytes
font_01_sfnt_off00009a06.bin
e23a42d523938dcbe4263abb4b1d0dcc44a76782db4bad3c41fcf7140861fb66
pdf-font-stream PDF embedded font (sfnt) at offset 0x9A06 10240 bytes