Malicious PDF — malware analysis report

Static analysis result for SHA-256 3299318a36aeac5f…

MALICIOUS

PDF

43.3 KB Created: 2020-08-28 12:24:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aa967c4ec62fbd280da556f6e368df02 SHA-1: 4744b694c987097f263d6b5b438a9a8682d9e7c6 SHA-256: 3299318a36aeac5f14822ef6865eb08b243ae9b37dd569b54440689b32859cb9
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting seemingly benign documents, but one critical link directs to a known malicious redirector. This suggests a link farm or SEO poisoning tactic designed to obscure the ultimate malicious destination. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves tricking the user into clicking through a series of links, ultimately leading to malicious infrastructure.

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=exponentes+en+fracciones
    • http://gagowibil.emlskills.com/uploads/1/3/2/7/132740649/9821013.pdf
    • http://tadokafi.juliehollis.co.uk/uploads/1/3/0/8/130874284/9387999.pdf
    • http://files.optimysmonline.com/uploads/1/3/1/4/131438324/patitubiwafika.pdf
    • https://cdn.shopify.com/s/files/1/0435/7367/4142/files/endocrine_system_notes_download.pdf
    • https://cdn.shopify.com/s/files/1/0427/9471/3244/files/kasanobisituwolu.pdf
    • https://cdn.shopify.com/s/files/1/0431/3628/6877/files/zijidodukav.pdf
    • https://cdn.shopify.com/s/files/1/0431/6214/0840/files/watotijomezoxavovuwebig.pdf
    • https://cdn.shopify.com/s/files/1/0437/0631/9001/files/fiweronufox.pdf
    • https://cdn.shopify.com/s/files/1/0432/2423/6199/files/lodubapumu.pdf
    • https://cdn.shopify.com/s/files/1/0433/1828/0357/files/guzanemaxog.pdf
    • https://cdn.shopify.com/s/files/1/0435/4483/8303/files/46967882288.pdf
    • https://cdn.shopify.com/s/files/1/0437/8991/0167/files/34326653088.pdf
    • https://cdn.shopify.com/s/files/1/0430/9788/2773/files/jodikatizoridaxupa.pdf
    • https://cdn.shopify.com/s/files/1/0439/9919/9390/files/23015715808.pdf
    • https://cdn.shopify.com/s/files/1/0433/9888/9635/files/gonedebomivuroxexi.pdf
    • https://cdn.shopify.com/s/files/1/0432/0670/5311/files/arizona_vehicle_tax_exempt_form.pdf
    • https://cdn.shopify.com/s/files/1/0431/2530/9601/files/dubai_burj_khalifa_video.pdf
    • https://cdn.shopify.com/s/files/1/0430/2805/4169/files/28087455202.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.

FilenameKindSourceSize
font_00_sfnt_off00006a14.bin
a7659fe9743efd723e37765fcafba2c48fe22d1b233dd7f64f27a47117d04ef1
pdf-font-stream PDF embedded font (sfnt) at offset 0x6A14 5000 bytes
font_01_sfnt_off00007b26.bin
48b042623dce36e68f9bd992a9ba14ec251894a07b3c8994507aaf49267bb89b
pdf-font-stream PDF embedded font (sfnt) at offset 0x7B26 10952 bytes