Malicious PDF — malware analysis report

Static analysis result for SHA-256 cef6ce6a1614b1d4…

MALICIOUS

PDF

45.1 KB Created: 2020-08-01 07:36:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2a3d4b7a61ba0bd9ef898612d497c1f0 SHA-1: 0f7e9b474fc59f9ded164fad0ff69748d1c5170d SHA-256: cef6ce6a1614b1d4a59660dabb1e8e0f4cd5588fc010eb4ae84f71617b445544
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector at 'https://ttraff.com/pify?keyword=99+range+guide+osrs'. The document body, though heavily obfuscated, also contains this URL and other links pointing to Shopify and custom domains, suggesting a link farm designed to distribute malicious content. The ML classifier strongly indicates maliciousness.

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=99+range+guide+osrs
    • http://files.lennonentertainment.com/uploads/1/3/1/4/131454383/nosijosizo.pdf
    • http://files.westwindsorhistory.com/uploads/1/3/0/8/130874204/vagadimanusazof-muxutex.pdf
    • http://files.425sqn.org/uploads/1/3/2/6/132681772/401846.pdf
    • http://files.myisom.net/uploads/1/3/1/4/131406885/7fec208b.pdf
    • https://cdn.shopify.com/s/files/1/0430/5698/8317/files/62297031547.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nomevorijodasulalo.pdf
    • https://cdn.shopify.com/s/files/1/0430/6590/1210/files/33580816673.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zeranosorijajigafa.pdf
    • https://cdn.shopify.com/s/files/1/0435/2560/3488/files/41914730532.pdf
    • https://cdn.shopify.com/s/files/1/0431/1220/2389/files/pexuzifu.pdf
    • https://cdn.shopify.com/s/files/1/0439/6512/0670/files/5686255409.pdf
    • https://cdn.shopify.com/s/files/1/0436/3137/8590/files/xirugupetupodufel.pdf
    • https://cdn.shopify.com/s/files/1/0432/1322/6139/files/20731404745.pdf
    • https://cdn.shopify.com/s/files/1/0434/7396/1110/files/27208836634.pdf
    • https://cdn.shopify.com/s/files/1/0430/5561/2057/files/kirajalakoxibamaworexagi.pdf
    • https://cdn.shopify.com/s/files/1/0431/6839/9524/files/59557804711.pdf
    • https://cdn.shopify.com/s/files/1/0435/8445/4817/files/24613546096.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_off000073f6.bin
ac98e37f161872678d669e1604d3c1c337a8b86c0546b054ac8b4513d7dbd277
pdf-font-stream PDF embedded font (sfnt) at offset 0x73F6 5020 bytes
font_01_sfnt_off00008514.bin
4e40b9ee151a2b31ac59ea3964b253ba77cefd52a834141f48c81c816d308000
pdf-font-stream PDF embedded font (sfnt) at offset 0x8514 10048 bytes