Malicious PDF — malware analysis report

Static analysis result for SHA-256 abcd2d0fbc7b4a6a…

MALICIOUS

PDF

43.2 KB Created: 2020-08-10 16:45:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a5872e0080aed6130cf84b185942f94b SHA-1: e0cefc5482efa4c8b123bbe0134aa59bccf46d6d SHA-256: abcd2d0fbc7b4a6a0b80243a0ef0915e2a94a112ae33904d5dd1ecf56064e7d5
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a heuristic firing indicating it links to known malicious redirector infrastructure, specifically `https://ttraff.ru/pify?keyword=celulas+procariotas+bacterias+pdf`. Additionally, the document exhibits characteristics of a PDF link farm, with numerous embedded links pointing to various domains, including multiple Shopify-hosted PDFs. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern involves luring users to a malicious site via a deceptive link within the document.

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=celulas+procariotas+bacterias+pdf
    • http://files.beespiderfree.com/uploads/1/3/0/7/130776366/lejafefariramesokipe.pdf
    • http://files.khhcommunications.com/uploads/1/3/0/9/130969879/bixekomajivulo.pdf
    • http://files.creatingfreedommovements.org/uploads/1/3/0/7/130739165/d695e1c8f0e.pdf
    • http://vofev.mhschoirs.org/uploads/1/3/1/4/131407227/bivebigivoluna.pdf
    • https://cdn.shopify.com/s/files/1/0434/2782/3778/files/52972849503.pdf
    • https://cdn.shopify.com/s/files/1/0428/9812/9059/files/79438751925.pdf
    • https://cdn.shopify.com/s/files/1/0434/3549/1490/files/30462458265.pdf
    • https://cdn.shopify.com/s/files/1/0429/5042/6780/files/51957362779.pdf
    • https://cdn.shopify.com/s/files/1/0437/1329/8581/files/35404746329.pdf
    • https://cdn.shopify.com/s/files/1/0431/8996/0861/files/4013009862.pdf
    • https://cdn.shopify.com/s/files/1/0433/8260/3927/files/worenifejananiwobozawula.pdf
    • https://cdn.shopify.com/s/files/1/0429/1526/6713/files/motunejobifogezowemodi.pdf
    • https://cdn.shopify.com/s/files/1/0434/3355/8168/files/62335502284.pdf
    • https://cdn.shopify.com/s/files/1/0436/8406/9526/files/xapagezigofefovufusuze.pdf
    • https://cdn.shopify.com/s/files/1/0432/5376/0162/files/67686569863.pdf
    • https://cdn.shopify.com/s/files/1/0430/9958/6714/files/business_model_generation_indonesia.pdf
    • https://cdn.shopify.com/s/files/1/0434/3519/6568/files/23204418200.pdf
    • https://cdn.shopify.com/s/files/1/0432/5461/2123/files/jizugo.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_off00006c05.bin
1d6b766ef0ff952afb5a676baddbed1b82c5d60a112b9ac1758d73b01c3713a6
pdf-font-stream PDF embedded font (sfnt) at offset 0x6C05 5196 bytes
font_01_sfnt_off00007db1.bin
203574af3674bce41bb305effaad809b832fcf8ba587d41fb3e251a5d5986e22
pdf-font-stream PDF embedded font (sfnt) at offset 0x7DB1 9868 bytes