Malicious PDF — malware analysis report

Static analysis result for SHA-256 41644b18d816d3ad…

MALICIOUS

PDF

41.2 KB Created: 2020-07-28 19:22:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 174c803572ada3a65671b181e53254f6 SHA-1: 6cddc13f2d9313fd635fe5a768d330ae9f7c5171 SHA-256: 41644b18d816d3ad8f0383e8420ca967ca62fdc4bb875a3607be5cec6cc25a5f
152 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, with one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, appears to be a lure related to a 'Cardell touch manual'. The presence of numerous external links suggests a link farm or redirection strategy to distribute malicious content.

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=cardell+touch+manual
    • http://files.similandiveguide.com/uploads/1/3/1/8/131871558/b419a.pdf
    • http://files.mrspeed.co.uk/uploads/1/3/2/6/132681865/guxatibutukopuxiw.pdf
    • http://files.heavenonearthestates.com/uploads/1/3/1/4/131405948/bab461cc0f.pdf
    • https://cdn.shopify.com/s/files/1/0435/3631/8616/files/kuxezobiwedikudinabo.pdf
    • https://cdn.shopify.com/s/files/1/0432/5667/6510/files/xowupunalabibirefi.pdf
    • https://cdn.shopify.com/s/files/1/0434/1969/7310/files/35650309107.pdf
    • https://cdn.shopify.com/s/files/1/0431/4418/3970/files/musawo.pdf
    • https://cdn.shopify.com/s/files/1/0434/3287/0044/files/35122448464.pdf
    • https://cdn.shopify.com/s/files/1/0434/0006/9283/files/mepinudinutelimapenoruli.pdf
    • https://cdn.shopify.com/s/files/1/0433/7673/8462/files/wigewojalisalejizojo.pdf
    • https://cdn.shopify.com/s/files/1/0429/6821/9799/files/44072830020.pdf
    • https://cdn.shopify.com/s/files/1/0429/8860/1503/files/65141402132.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/58014629257.pdf
    • https://cdn.shopify.com/s/files/1/0430/3316/5986/files/99098523877.pdf
    • https://cdn.shopify.com/s/files/1/0428/4802/6780/files/77517466815.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/
    • https://cdn.shopify.com/s

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006249.bin
b9beeef52bfbe5b65cf534c94d3a1b951805348f9b56559497cdbe5303726016
pdf-font-stream PDF embedded font (sfnt) at offset 0x6249 4856 bytes
font_01_sfnt_off000072a0.bin
5048736763b5cda048e66b828565900be6a411b2637dbd541c43f83326aef68c
pdf-font-stream PDF embedded font (sfnt) at offset 0x72A0 11024 bytes