PDF malware analysis — malicious · 818d6df9df22d6b5

MALICIOUS

PDF

49.3 KB Created: 2020-07-29 01:54:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 976c465ec69f535559725f41e70b4cd3 SHA-1: c04d4b5b1c44fd6c41fd3cd98e0e4f897f7b000d SHA-256: 818d6df9df22d6b5f7bbcc3d5ed6ae062ebcbf1e17e22be282391e8722385dfe

150 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1566.002 Spearphishing Attachment T1071.001 Web Protocols

The PDF file contains embedded links that redirect to malicious infrastructure, specifically identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The document body, though heavily obfuscated, suggests a lure related to 'official business letterhead format'. The presence of numerous external PDF links, as indicated by 'PDF_SEO_LINK_FARM', further supports a malicious intent to distribute or redirect users. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 3

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.
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=official+business+letterhead+format
- http://files.malamathesea.com/uploads/1/3/1/1/131163590/vunuro.pdf
- http://files.playfullpotential.com/uploads/1/3/1/6/131607374/lomov-tuliz.pdf
- http://files.ehabacademy.com/uploads/1/3/1/8/131871704/01146ea.pdf
- http://files.ehabacademy.com/uploads/1/3/
- https://cdn.shopify.com/s/files/1/0431/0240/4769/files/65279780346.pdf
- https://cdn.shopify.com/s/files/1/0430/8949/4177/files/73433344157.pdf
- https://cdn.shopify.com/s/files/1/0429/2801/3471/files/dajiludirelogepewe.pdf
- https://cdn.shopify.com/s/files/1/0430/9457/3205/files/vekalunifevagen.pdf
- https://cdn.shopify.com/s/files/1/0438/8444/5864/files/dogavodut.pdf
- https://cdn.shopify.com/s/files/1/0429/7015/3113/files/91927193273.pdf
- https://cdn.shopify.com/s/files/1/0428/2499/0887/files/tadawajab.pdf
- https://cdn.shopify.com/s/files/1/0438/8824/6936/files/nomawefisogiw.pdf
- https://cdn.shopify.com/s/files/1/0430/0003/7527/files/kosidudoturetiliturolawaw.pdf
- https://cdn.shopify.com/s/files/1/0434/5567/6580/files/46815472936.pdf
- https://cdn.shopify.com/s/files/1/0429/6556/5589/files/nixoz.pdf
- https://cdn.shopify.com/s/files/1/0428/3770/4867/files/vekonawebigivafanixam.pdf
- https://cdn.shopify.com/s/files/1/0428/8846/2495/files/tovodilaja.pdf
- https://cdn.shopify.com/s/files/1/0429/4492/1766/files/5473706622.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off000083b8.bin` `a09288c295e2c86095dfd5bee2cc6874ca8015243e62cad1785e20a491d488cb`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x83B8	5308 bytes
`font_01_sfnt_off0000958a.bin` `5028bec38ce31aa2d0bb2a35835d5763a32472c7b10cfd194b8cb1b883761698`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x958A	10092 bytes

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