Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a22b2de32d49030…

MALICIOUS

PDF

39.9 KB Created: 2020-08-03 10:08:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d5d04488ee92cbd3165331e74608376a SHA-1: fa521978f628494b86d80365567e02a4c301303b SHA-256: 3a22b2de32d4903014e57c9de121d41beae9dc325ef18fdfde1f05ebac7e960d
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one specifically pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated, but the presence of the URL 'https://ttraff.cc/pify?keyword=golang+load+balancer' suggests a redirection attempt. The PDF structure indicates a link farm designed to distribute traffic to various external resources.

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=golang+load+balancer
    • http://files.fitness-slayers.com/uploads/1/3/0/7/130776591/3333096.pdf
    • http://files.jme-whips.com/uploads/1/3/1/3/131379296/juxedizegepozituv.pdf
    • http://files.carolynlsmith.com/uploads/1/3/1/4/131453177/vowimubufak.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xuvekalododit.pdf
    • https://cdn.shopify.com/s/files/1/0433/7362/5500/files/julapuzibomekilumara.pdf
    • https://cdn.shopify.com/s/files/1/0432/8158/0200/files/mobodenitekewuj.pdf
    • https://cdn.shopify.com/s/files/1/0432/2924/9694/files/minecraft_cleric_workstation.pdf
    • https://cdn.shopify.com/s/files/1/0427/7973/8278/files/11956688828.pdf
    • https://cdn.shopify.com/s/files/1/0431/6885/8272/files/derunodupujibi.pdf
    • https://cdn.shopify.com/s/files/1/0429/6255/0940/files/sefedi.pdf
    • https://cdn.shopify.com/s/files/1/0431/8131/0114/files/waluxokikixuwakujiwivika.pdf
    • https://cdn.shopify.com/s/files/1/0429/8244/1113/files/80785075715.pdf
    • https://cdn.shopify.com/s/files/1/0427/3173/3159/files/ravovixogifefisimunelinaj.pdf
    • https://cdn.shopify.com/s/files/1/0427/6014/3014/files/74044293287.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_off00005d6d.bin
c8e0d3164cc6ac550f1532b9cfddfd4d2ecdaea408248e66b61a91dae80d681a
pdf-font-stream PDF embedded font (sfnt) at offset 0x5D6D 5100 bytes
font_01_sfnt_off00006ed3.bin
ef20751cff6234dab272e692a255b3645f6d809009999c3f7846ea17040bd539
pdf-font-stream PDF embedded font (sfnt) at offset 0x6ED3 10808 bytes