Malicious PDF — malware analysis report

Static analysis result for SHA-256 72265b61526506b3…

MALICIOUS

PDF

44.3 KB Created: 2020-08-22 16:50:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 80364db24403987df10afb9a6c2545f8 SHA-1: 4e57e87b1e27641191188961243dea6b3d19e8da SHA-256: 72265b61526506b3d4c113d232dd27d0ab1c23d3a5e09daf6e70d2a0d9199b26
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for linking to malicious redirector infrastructure, specifically pointing to 'ttraff.cc'. The document body, though heavily obfuscated, contains text related to 'Mithibai college online admission form for fyba' and also includes the malicious URL. The presence of numerous embedded URLs, many pointing to Shopify, suggests a link farm or SEO manipulation tactic to distribute malicious content. No scripts were extracted, but the PDF structure itself is deemed malicious by an ML classifier.

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=mithibai+college+online+admission+form+for+fyba
    • http://gejadibef.trinitylutheranburlington.org/uploads/1/3/0/7/130740062/gerekuziguvusat.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/7066/8453/files/24613146311.pdf
    • https://cdn.shopify.com/s/files/1/0428/3881/8982/files/59537421139.pdf
    • https://cdn.shopify.com/s/files/1/0429/7365/9290/files/puxusataxaloxegoban.pdf
    • https://cdn.shopify.com/s/files/1/0437/9148/3031/files/classification_techniques_in_data_mining.pdf
    • https://cdn.shopify.com/s/files/1/0431/7272/4885/files/78309708799.pdf
    • https://cdn.shopify.com/s/files/1/0437/6811/9445/files/joveruleforol.pdf
    • https://cdn.shopify.com/s/files/1/0440/0631/0046/files/gamefomali.pdf
    • https://cdn.shopify.com/s/files/1/0427/6636/8935/files/41487218929.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005823.bin
ce1b986ae927d673d19d8c927b97bba09195ff7dfc02aefa081cd6c401933d4e
pdf-font-stream PDF embedded font (sfnt) at offset 0x5823 5684 bytes
font_01_sfnt_off00006b43.bin
54843bc025129082fb3902c34bb3076b7a91c364d8bead020ef85985102417cf
pdf-font-stream PDF embedded font (sfnt) at offset 0x6B43 10540 bytes
font_02_sfnt_off00008f47.bin
6e3fbd491d8b71441998836ddca0d0c102716a221ea14f8143929167ad9a79b3
pdf-font-stream PDF embedded font (sfnt) at offset 0x8F47 16164 bytes