Malicious PDF — malware analysis report

Static analysis result for SHA-256 372138c66ce61014…

MALICIOUS

PDF

38.0 KB Created: 2020-08-10 00:19:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f554dd9fb1536bd9b5eedf4c148eadec SHA-1: ef832eb81fc4213648a3e4d8a79f0a83b8180dc4 SHA-256: 372138c66ce61014a7960dd7c920231fe1961ae50990cf1df58bffa3fa787f23
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=can+you+rearrange+pages+in+a+pdf+file'. Additionally, it features a PDF link farm with 30 external links, many hosted on Shopify, suggesting an attempt to manipulate search engine results or distribute content. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the extensive linking and redirector indicate a malicious intent to lure users to harmful sites.

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=can+you+rearrange+pages+in+a+pdf+file
    • http://files.nancybrophyauthor.com/uploads/1/3/1/6/131637503/94ba49.pdf
    • http://weropemi.anntowell.com/uploads/1/3/2/7/132740892/bixuxuxum-vukisi-vonojewu-zetekerujado.pdf
    • http://files.moorelandproductions.com/uploads/1/3/1/3/131397973/jizabomuxi.pdf
    • http://nomisumo.dsrgolftournament.com/uploads/1/3/1/8/131856772/2096665.pdf
    • https://cdn.shopify.com/s/files/1/0435/2396/5080/files/brche_vergleichen_bungen.pdf
    • https://cdn.shopify.com/s/files/1/0431/7121/7565/files/jilaruwutijoseterajagane.pdf
    • https://cdn.shopify.com/s/files/1/0455/6272/4517/files/layne_norton_fat_loss_forever_free.pdf
    • https://cdn.shopify.com/s/files/1/0433/6258/2693/files/29830689675.pdf
    • https://cdn.shopify.com/s/files/1/0434/3654/0069/files/91060462814.pdf
    • https://cdn.shopify.com/s/files/1/0430/1655/2605/files/87418262882.pdf
    • https://cdn.shopify.com/s/files/1/0434/1887/8104/files/19640574479.pdf
    • https://cdn.shopify.com/s/files/1/0435/3759/6575/files/semukere.pdf
    • https://cdn.shopify.com/s/files/1/0431/7449/4369/files/zuvejetos.pdf
    • https://cdn.shopify.com/s/files/1/0437/1139/8041/files/zusija.pdf
    • https://cdn.shopify.com/s/files/1/0434/6265/6152/files/jisuwibowut.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_off0000576d.bin
96abc050a736ecedd21339d5a48fd32455f6d32cf9b67500277e44c7d693f079
pdf-font-stream PDF embedded font (sfnt) at offset 0x576D 5216 bytes
font_01_sfnt_off00006942.bin
812d7aa4e8664db4222b26690327beb325cbc6c94c71f823742107ef1d598c50
pdf-font-stream PDF embedded font (sfnt) at offset 0x6942 9916 bytes