Malicious PDF — malware analysis report

Static analysis result for SHA-256 426d309dd39d1234…

MALICIOUS

PDF

44.6 KB Created: 2020-08-24 14:49:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a011999ce058e9d81ced23f116d489c1 SHA-1: 7b54e93f5371feebc3f279cceb42c7cbc8d2a6b3 SHA-256: 426d309dd39d1234dec66b0e710b65d9409787d2d8e07c8066a8b610df5fa940
150 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, many pointing to Shopify-hosted PDFs, which is indicative of a link farm. One of the primary links redirects through a known malicious redirector, ttraff.cc. The ML classifier also strongly flagged this PDF as malicious. The presence of a link farm and a malicious redirector suggests an attempt to either distribute malicious content or manipulate search engine results.

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.cc/pify?keyword=chundari+penne+song+free
    • http://rukagex.stepheningram.net/uploads/1/3/0/9/130969754/bagavupinubujituk.pdf
    • http://files.hugsplus.com/uploads/1/3/1/4/131483386/1a58d.pdf
    • http://files.davidbenjaminverstraete.com/uploads/1/3/2/6/132682851/jugidunigosirew_guladi_sujuvuvakizoga_zaxaxid.pdf
    • https://cdn.shopify.com/s/files/1/0434/4571/5109/files/arduino_library_functions.pdf
    • https://cdn.shopify.com/s/files/1/0434/6734/1974/files/voxutujimubulabeju.pdf
    • https://cdn.shopify.com/s/files/1/0433/5671/7205/files/the_algorithm_design_manual_solutions_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/6451/5994/files/71338173371.pdf
    • https://cdn.shopify.com/s/files/1/0433/4390/4927/files/risazadaguj.pdf
    • https://cdn.shopify.com/s/files/1/0430/7946/7170/files/tagawozi.pdf
    • https://cdn.shopify.com/s/files/1/0435/5119/5299/files/taxudobarawa.pdf
    • https://cdn.shopify.com/s/files/1/0430/2965/9797/files/39299337975.pdf
    • https://cdn.shopify.com/s/files/1/0429/5429/3402/files/24628331276.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004a61.bin
a9de1dd76109d90cd549c1b79452c0b72c2dcd9d3de17063f69b4bbd7eb12641		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4A61 5096 bytes
font_01_sfnt_off00005b9e.bin
b27325d79538cf1a40d4db5cd699e766f4121f0e7ad8f8467d1b906b618df7c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B9E 3668 bytes
font_02_sfnt_off00006983.bin
69b6875d8797a188905d49c03f5634d38b29dd2a0a5d7ae9c274873949c2422c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6983 14176 bytes
font_03_sfnt_off0000958e.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x958E 4324 bytes

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