Malicious PDF — malware analysis report

Static analysis result for SHA-256 9660a61b6b5c257a…

MALICIOUS

PDF

42.7 KB Created: 2020-07-23 20:39:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f2544dc1a190fd65eb5d23140e436c25 SHA-1: 5b832d0830ecd3ddf363575f3bc1ab8ae454e795 SHA-256: 9660a61b6b5c257adc5a7dcba008158dc97ca3fda87da3633f1c3a97877fed57
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF file contains a large number of embedded links, many of which point to external resources. One critical heuristic indicates that the PDF links to known malicious redirector infrastructure, specifically 'ttraff.com'. The document body, though heavily obfuscated, appears to be a lure related to 'chilly cow ice cream nutritional information', likely intended to mask the malicious intent of redirecting users to harmful sites. The ML classifier strongly flagged this PDF as malicious.

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.com/pify?keyword=chilly+cow+ice+cream+nutritional+information
    • http://files.funnyfacespz.co.uk/uploads/1/3/1/4/131483361/jusotopirak.pdf
    • http://files.cottagepreschool.net/uploads/1/3/2/7/132740545/2617929.pdf
    • http://files.stephcolehair.com/uploads/1/3/1/4/131436956/fatejom.pdf
    • http://files.grettawilson.com/uploads/1/3/1/4/131408954/7905468.pdf
    • https://cdn.shopify.com/s/files/1/0431/1928/0288/files/buzokix.pdf
    • https://cdn.shopify.com/s/files/1/0428/9105/1161/files/20133015116.pdf
    • https://cdn.shopify.com/s/files/1/0436/0978/4482/files/29883709728.pdf
    • https://cdn.shopify.com/s/files/1/0433/7614/8638/files/fuvudutu.pdf
    • https://cdn.shopify.com/s/files/1/0433/7896/6691/files/8307528565.pdf
    • https://cdn.shopify.com/s/files/1/0431/8016/3227/files/73353101797.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nowivozepax.pdf
    • https://cdn.shopify.com/s/files/1/0431/4392/1820/files/37559654916.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nuxekenosagulowagegur.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/18983443830.pdf
    • https://cdn.shopify.com/s/files/1/0427/5906/1670/files/xirezusenupinofusi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/50398535586.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_off000067d8.bin
33ca263699e6e8e4f169a2422d4bb3bf5ad57924a91478388966330faaca1edd
pdf-font-stream PDF embedded font (sfnt) at offset 0x67D8 5044 bytes
font_01_sfnt_off000078ea.bin
3ab779e5cf839b40269deafb91557f96da8c5416448c85a66be6d7037da3b900
pdf-font-stream PDF embedded font (sfnt) at offset 0x78EA 10780 bytes