Malicious PDF — malware analysis report

Static analysis result for SHA-256 106cf73bfaf9a116…

MALICIOUS

PDF

41.3 KB Created: 2020-08-28 09:06:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4e27cfcffd8a566a7517c26d0ca8a942 SHA-1: c3d96fddbed6e5d7eb5cded2df05662c2bba1d50 SHA-256: 106cf73bfaf9a116ba907efd19e4f5d402b6c93a871fb23954865c2a9878f87d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded links, with one specifically pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body contains text that appears to be SEO spam, likely to mask the malicious intent of the embedded links. No scripts were extracted, but the presence of multiple links suggests a downloader or redirector pattern.

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.ru/pify?keyword=divinity+original+sin+multiplayer+4+player
    • http://pivuxaw.damianduguid.com/uploads/1/3/1/3/131398140/3102564.pdf
    • http://widev.emilylwebb.com/uploads/1/3/0/7/130738732/vijatelifixefi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/7152/7319/files/watatapawarus.pdf
    • https://cdn.shopify.com/s/files/1/0434/7383/0040/files/algebra_and_trigonometry_stewart.pdf
    • https://cdn.shopify.com/s/files/1/0428/9318/1087/files/senujumax.pdf
    • https://cdn.shopify.com/s/files/1/0439/3605/5454/files/38967702107.pdf
    • https://cdn.shopify.com/s/files/1/0431/6341/8784/files/fifegiso.pdf
    • https://cdn.shopify.com/s/files/1/0433/8925/5847/files/bookishly_ever_after.pdf
    • https://cdn.shopify.com/s/files/1/0431/0227/3703/files/backup_android_rom_to_computer.pdf
    • https://cdn.shopify.com/s/files/1/0430/8110/5562/files/equivalent_expressions_worksheet_7th_grade.pdf
    • https://cdn.shopify.com/s/files/1/0437/8509/3272/files/watch_dogs_2_mods_pc.pdf
    • https://cdn.shopify.com/s/files/1/0433/9567/8359/files/67394793953.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006442.bin
4ed811a8b5a21a323175fa85cec75d712e2a9bed4b2c0b280c99dea503fb71de
pdf-font-stream PDF embedded font (sfnt) at offset 0x6442 5388 bytes
font_01_sfnt_off00007697.bin
4fe875ae19a97f7fb31c1e29e8940dfb2c5eb3277d9a079947934eacdf186162
pdf-font-stream PDF embedded font (sfnt) at offset 0x7697 9920 bytes