Malicious PDF — malware analysis report

Static analysis result for SHA-256 523746480563777e…

MALICIOUS

PDF

45.8 KB Created: 2020-08-20 19:54:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a4c1f9312c687e16e4e34f9bf45189b0 SHA-1: d77352ccbc1b8b86bed2d924a9e43d9890d51a43 SHA-256: 523746480563777eff4a9f933824ad3df0886030a5fb4086a4feb40a3913a75b
150 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a malicious URL, disguised with text suggesting it's a download for video editing software. This is further supported by heuristics indicating a malicious redirector link and a link farm. The ML classifier also strongly flagged this PDF as malicious. The primary IOC is the malicious redirector URL.

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=video+editing+software+free+mac
    • http://files.arizonafiberartsretreat.com/uploads/1/3/1/8/131871727/5654098.pdf
    • http://bajubo.yvonnedubourdieu.ca/uploads/1/3/2/6/132683014/kosotajojulamar.pdf
    • http://liwovigan.sueinvenice.com/uploads/1/3/2/6/132681482/4425094.pdf
    • https://cdn.shopify.com/s/files/1/0432/3953/8851/files/reruterupodunojeraliz.pdf
    • https://cdn.shopify.com/s/files/1/0434/5082/6919/files/kansas_city_hourly_weather_report.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/87463685859.pdf
    • https://cdn.shopify.com/s/files/1/0431/7092/2652/files/vegimunolifevof.pdf
    • https://cdn.shopify.com/s/files/1/0429/7005/4805/files/nomezovanuweluvumagaxugi.pdf
    • https://cdn.shopify.com/s/files/1/0428/0962/2691/files/38577057314.pdf
    • https://cdn.shopify.com/s/files/1/0431/7321/6411/files/electronic_structure_of_carbon_nanotubes.pdf
    • https://cdn.shopify.com/s/files/1/0447/4827/5863/files/cement_forming_boards.pdf
    • https://cdn.shopify.com/s/files/1/0431/5139/2922/files/ars_poetica_macleish.pdf
    • https://cdn.shopify.com/s/files/1/0434/7399/3890/files/mewofowakid.pdf
    • https://cdn.shopify.com/s/files/1/0435/4444/5092/files/betting_strategy.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_off0000744d.bin
727c5035df8e61752769e7925c345c826ce73b037b40570bbcd24a014d3c269e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x744D 5364 bytes
font_01_sfnt_off0000868d.bin
09c65d35402e1600546050eb2a8e24fa3f0c924b460f7c10e5c2389dcb8ca5b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x868D 10516 bytes

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