Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef21498a5c9cccd9…

MALICIOUS

PDF

46.5 KB Created: 2020-07-16 20:48:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: acaa0326ab1338c7a9f1880f9ab5a754 SHA-1: f269cc32ebea163baaeebedaceb370872cebc8b7 SHA-256: ef21498a5c9cccd938aa69ea9df18557c83b322657ffa8393fe29beb5df124a0
150 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, a common tactic for SEO poisoning and redirecting users to malicious sites. The primary heuristic indicates a malicious redirector link to 'ttraff.com', disguised with a seemingly benign keyword. The document body, though heavily obfuscated, suggests a lure related to a 'stepper motor catalogue'. The presence of a large number of external PDF links further supports the SEO link farm heuristic.

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.com/wb?keyword=stepper%20motor%20catalogue%20pdf
    • http://files.mljanderson.org/uploads/1/3/1/8/131857038/dafuxodekeb-newafaneba-fuwuxoxig.pdf
    • http://files.youdirtydawgpdx.com/uploads/1/3/1/4/131453907/2909670.pdf
    • http://files.willowparkcitizens.org/uploads/1/3/2/3/132302749/ninil.pdf
    • http://files.reckonin.com/uploads/1/3/2/6/132695257/kewikidaruxajoninunu.pdf
    • http://files.samharvey.co.uk/uploads/1/3/2/6/132695780/4750316.pdf
    • https://cdn.shopify.com/s/files/1/0428/3963/8179/files/bafilitatu.pdf
    • https://cdn.shopify.com/s/files/1/0433/7857/3464/files/jovutafewububo.pdf
    • https://cdn.shopify.com/s/files/1/0430/0275/7281/files/duzatuliki.pdf
    • https://xosujitotodi.files.wordpress.com/2020/07/24082085061.pdf
    • https://tozoxoxejon.files.wordpress.com/2020/07/65847511555.pdf
    • https://mudosezu.files.wordpress.com/2020/07/kadobuvav.pdf
    • https://najileriwis.files.wordpress.com/2020/06/kafisaxokanejaw.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/69296453687.pdf
    • https://cdn.shopify.com/s/files/1/0428/3600/0931/files/76957469363.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nenixuraxolitater.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lojuxefututa.pdf
    • https://cdn.shopify.com/s/files/1/0431/4251/2802/files/sitazegig.pdf
    • https://cdn.shopify.com/s/files/1/0428/7715/7542/files/wokojawe.pdf
    • https://cdn.shopify.com/s/files/1/0432/3731/0632/files/bubawadaruro.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_off000070e2.bin
3fc56016f4c8394918840f621bb70c893ac15eaeaebf92c8feb92e9ca5be8f8f
pdf-font-stream PDF embedded font (sfnt) at offset 0x70E2 5128 bytes
font_01_sfnt_off00008256.bin
a4bb63b319fc5c376f01c0d703acba13c1b785a31140098ddd16097bfec146ce
pdf-font-stream PDF embedded font (sfnt) at offset 0x8256 12948 bytes