Malicious PDF — malware analysis report

Static analysis result for SHA-256 d57ed7d358dc72f6…

MALICIOUS

PDF

50.3 KB Created: 2020-07-22 19:25:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e778c90f4575ca3c83662d91018fe29f SHA-1: e67a3c834e330de80b82d5c16ccf8a1ca4235bc7 SHA-256: d57ed7d358dc72f6393bce267cb2501d65144533290f222f67d31e462c429860
154 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by an ML classifier and contains multiple links to external resources. One critical heuristic indicates the presence of a PDF link to a known malicious redirector infrastructure, specifically 'ttraff.cc'. Another critical heuristic identified a PDF link farm, with numerous links pointing to external PDFs, many hosted on 'cdn.shopify.com'. The document body, though heavily obfuscated, contains text related to competitive programming and the wkhtmltopdf application, suggesting a lure. The primary attack pattern involves redirecting users to malicious sites under the guise of providing competitive programming resources.

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.cc/wb?keyword=competitive%20programming%201%20pdf
    • http://files.fossilmossbears.com/uploads/1/3/2/3/132303269/1603700.pdf
    • http://files.adelegershatercpa.com/uploads/1/3/1/3/131380029/6390090.pdf
    • http://files.dasilvavideo.com/uploads/1/3/0/7/130775131/vuwekuxipejax.pdf
    • http://files.soapbarlounge.com/uploads/1/3/0/7/130776718/luriza_bokitewakikizu_sepipe.pdf
    • http://files.dj-b-fore.com/uploads/1/3/2/6/132695418/bc818c0.pdf
    • https://cdn.shopify.com/s/files/1/0437/5199/7592/files/nusinam.pdf
    • https://cdn.shopify.com/s/files/1/0434/4433/8838/files/govos.pdf
    • https://cdn.shopify.com/s/files/1/0430/8559/4775/files/pegolusal.pdf
    • https://bazugilaj.files.wordpress.com/2020/06/zixebeta.pdf
    • https://lomodusemuw.files.wordpress.com/2020/06/lekamuduxaxuku.pdf
    • https://xegetiku.files.wordpress.com/2020/07/venumapuzajupes.pdf
    • https://pojolukowo.files.wordpress.com/2020/06/36586024452.pdf
    • https://gokubozuni.files.wordpress.com/2020/07/53444688693.pdf
    • https://cdn.shopify.com/s/files/1/0432/9360/6056/files/fepubegegit.pdf
    • https://cdn.shopify.com/s/files/1/0436/2207/2480/files/nevewenu.pdf
    • https://cdn.shopify.com/s/files/1/0431/6141/9927/files/18078930047.pdf
    • https://cdn.shopify.com/s/files/1/0437/3712/0933/files/58827392491.pdf
    • https://cdn.shopify.com/s/files/1/0429/6556/5589/files/jokutiwav.pdf
    • https://cdn.shopify.com/s/files/1/0435/1423/2996/files/kovipise.pdf
    • https://cdn.shopify.com/s/files/1/0428/4222/6854/files/5479827519.pdf
    • https://cdn.shopify.com/s/files/1/0434/8693/7253/files/nidamomoxivudinak.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_off000079a9.bin
ed6575b816f04d55622c8796d4183c21b68ffc1dc1729e52a2bce5aea9d20c95		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79A9 5072 bytes
font_01_sfnt_off00008ae5.bin
76fbdcf9a6786ca3c336d51551a59ce4354a2ccf72ce53b058c7d29a3da6aff1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8AE5 15556 bytes

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