Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8090caab666df10…

MALICIOUS

PDF

35.2 KB Created: 2020-08-02 10:05:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fbe42892534aa0bb103cc9ad154ae31f SHA-1: 548ebf4c10097bbc46a8060b4b087e30adb82c4e SHA-256: c8090caab666df10ca79b12e04487e0912ac1ad80d42b3f69ffeba4c684e8bb7
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious by an ML classifier and contains a large number of embedded links, with one pointing to a known malicious redirector. The document body contains obfuscated text and the URL 'https://ttraff.ru/pify?keyword=longboards+lees+summit' which is likely part of a link farm or phishing campaign. The presence of numerous Shopify-hosted PDFs suggests an attempt to blend malicious links with seemingly benign 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.ru/pify?keyword=longboards+lees+summit
    • http://files.grantrestrict.com/uploads/1/3/0/8/130815026/gozamasomidin-tokajefi.pdf
    • http://files.threadpaint.com/uploads/1/3/1/3/131384070/3064f22.pdf
    • http://files.gxy.net/uploads/1/3/2/6/132682295/mokali_rebun_rusodimumadatus_sodiralumod.pdf
    • http://files.jahafrica.com/uploads/1/3/1/3/131378837/kutejetoku_danufoji_lirifufogov_fomixanatin.pdf
    • https://cdn.shopify.com/s/files/1/0431/1095/7210/files/xusawomegakugibidonu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/20424522606.pdf
    • https://cdn.shopify.com/s/files/1/0431/6397/5835/files/81491527065.pdf
    • https://cdn.shopify.com/s/files/1/0431/1754/3588/files/gegides.pdf
    • https://cdn.shopify.com/s/files/1/0431/8196/5461/files/120_pounds_to_kg.pdf
    • https://cdn.shopify.com/s/files/1/0434/6370/4729/files/6972819836.pdf
    • https://cdn.shopify.com/s/files/1/0432/2666/1023/files/pokemon_fusion_maker.pdf
    • https://cdn.shopify.com/s/files/1/0428/1643/8438/files/vemizexeluvobuwupokizaj.pdf
    • https://cdn.shopify.com/s/files/1/0429/4243/1395/files/86658060923.pdf
    • https://cdn.shopify.com/s/files/1/0431/2242/6013/files/bexan.pdf
    • https://cdn.shopify.com/s/files/1/0434/1481/4885/files/wobenukeg.pdf
    • https://cdn.shopify.com/s/files/1/0435/8465/1423/files/22261308589.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_off00004b51.bin
f907058449befce3cc2fd60c49851e4b61a0d13e1a7a3ad3b999cc22d9102d8c
pdf-font-stream PDF embedded font (sfnt) at offset 0x4B51 5228 bytes
font_01_sfnt_off00005d01.bin
272996277e5cab7249a81478000bec3e87525c3b997f67217b9928721bf9856d
pdf-font-stream PDF embedded font (sfnt) at offset 0x5D01 10352 bytes