Malicious PDF — malware analysis report

Static analysis result for SHA-256 c77819e47dec8bb5…

MALICIOUS

PDF

42.4 KB Created: 2020-07-25 19:48:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c3553c80cb0771dda550c20533a5a14e SHA-1: 7981ef86627e4117dec639449ac77d2f7bbfcea2 SHA-256: c77819e47dec8bb50d4ea439378c0a2d9b123b8df0a283713f86ef25566e4e38
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.cc'. This indicates the document is designed to redirect users to potentially harmful content. Additionally, a PDF SEO link farm heuristic was triggered, suggesting the document is part of a larger effort to generate traffic or distribute malicious files via numerous links. The ML classifier also strongly flagged this PDF as malicious.

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=angulos+inscritos+y+centrales+ejercicios+resueltos+pdf
    • http://files.nswier.org/uploads/1/3/0/9/130969473/856808.pdf
    • http://files.destinationally.net/uploads/1/3/1/8/131856543/joxunamuvafarise.pdf
    • http://files.samuelesegat.com/uploads/1/3/1/4/131438362/5276969.pdf
    • http://files.nileswesttheatre.com/uploads/1/3/1/8/131857782/xawixaxe_fobusawilari_dipopegulagilot_datutokes.pdf
    • http://files.nileswesttheatre.com/uploads/1/3/1/8/131857782/xawixaxe_fobusawilari_dipopegulagilot_datutokes.pd
    • https://cdn.shopify.com/s/files/1/0432/7122/5494/files/51972304343.pdf
    • https://cdn.shopify.com/s/files/1/0430/5698/8311/files/serezadimalo.pdf
    • https://cdn.shopify.com/s/files/1/0431/5627/5360/files/jalixodubigarigoroxaramem.pdf
    • https://cdn.shopify.com/s/files/1/0428/0942/6079/files/32129138548.pdf
    • https://cdn.shopify.com/s/files/1/0431/8248/9762/files/xokufeveriles.pdf
    • https://cdn.shopify.com/s/files/1/0433/4052/9816/files/japab.pdf
    • https://cdn.shopify.com/s/files/1/0427/6781/0726/files/35062338101.pdf
    • https://cdn.shopify.com/s/files/1/0430/7494/5184/files/64113599227.pdf
    • https://cdn.shopify.com/s/files/1/0428/1712/6563/files/dasix.pdf
    • https://cdn.shopify.com/s/files/1/0433/0346/9221/files/xolodebakudaturadexibew.pdf
    • https://cdn.shopify.com/s/files/1/0434/1478/2103/files/55582569124.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_off00006442.bin
0c7304a88582163c935149b5c6e7c32464cb530abedcca1790080e68bd3bb2a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6442 5372 bytes
font_01_sfnt_off000076a0.bin
4f4f5a421d5e56bc50c5477fe76c6e18afbba6ecc87a42e752713016ff675adc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76A0 10988 bytes

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