Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1e03629343d8030…

MALICIOUS

PDF

37.7 KB Created: 2020-08-11 12:44:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9ded03928241e682500d712e6f483d28 SHA-1: 9577f10fc747c8e414cba27cb870fd6722b783f3 SHA-256: b1e03629343d8030bd662bf074d7a4b252948c27e1733dab4ad7dc63a5858c9b
150 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, many pointing to external PDF files hosted on various domains, suggesting a link farm for SEO manipulation or redirection. One critical heuristic firing indicates a direct link to a known malicious redirector at 'https://ttraff.com/pify?keyword=biserial+correlation+pdf'. The document body, though heavily obfuscated, contains this URL and other PDF links, reinforcing the redirection attempt. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=biserial+correlation+pdf
    • http://files.labyrinthcreations.com/uploads/1/3/0/9/130969543/7674498.pdf
    • http://bemax.glenvarbaptist.com/uploads/1/3/0/7/130775432/3335908.pdf
    • http://files.midwestbooksellers.org/uploads/1/3/2/6/132681670/juruj.pdf
    • http://files.crisbaumann.com/uploads/1/3/1/6/131606248/fevusoz.pdf
    • https://cdn.shopify.com/s/files/1/0432/6490/1270/files/45360178612.pdf
    • https://cdn.shopify.com/s/files/1/0431/5978/1538/files/70316492727.pdf
    • https://cdn.shopify.com/s/files/1/0435/2281/8200/files/jukasem.pdf
    • https://cdn.shopify.com/s/files/1/0431/9769/4114/files/zomigowisurimed.pdf
    • https://cdn.shopify.com/s/files/1/0438/7730/2427/files/niradijepofezure.pdf
    • https://cdn.shopify.com/s/files/1/0437/4737/7301/files/2622598423.pdf
    • https://cdn.shopify.com/s/files/1/0434/0151/1068/files/resoxomovagazokulewikix.pdf
    • https://cdn.shopify.com/s/files/1/0438/4797/5062/files/bengali_calendar_1426.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tobilefoseparavako.pdf
    • https://cdn.shopify.com/s/files/1/0437/0700/7127/files/zuluvuvizesakegazirav.pdf
    • https://cdn.shopify.com/s/files/1/0435/4136/4890/files/55350213647.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_off00005565.bin
5cd93a7c2a54aad438833481656b78137c107bf39505f9c708f1ce0a6eb48f8c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5565 5200 bytes
font_01_sfnt_off00006715.bin
371a30146366d2d289562996475624d6b7c22aba40684808281de2695f04cdf0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6715 10356 bytes

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