Malicious PDF — malware analysis report

Static analysis result for SHA-256 43a701d8b625bb2e…

MALICIOUS

PDF

40.0 KB Created: 2021-05-11 16:41:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 15c9f3b396e520541f2462cd3a0c03be SHA-1: 0331e6ec6e44054c3ade32e68aa0d240e8ebd612 SHA-256: 43a701d8b625bb2edf955103bbdf37172221d65f79cfe712bf2766e956635828
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that lead to known malicious redirector infrastructure, specifically targeting users with lures related to game hacks and free currency. The document body and extracted URLs strongly suggest a phishing or scam attempt, likely to lead the user to a site that may host further malware or attempt credential harvesting. No scripts were extracted, but the presence of malicious links and the ML classifier's high confidence indicate a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • 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.
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://netcdn.xyz/app/406889139/free-coin-master-cheats-game-hack In PDF document text
    • http://gomelavto.by/images/how-to-get-free-robux-for-free_GM431946152.pdfIn PDF document text
    • http://gomelavto.by/images/apps-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://gomelavto.by/images/free-robux-no-human-verification-no-survey_GM431946152.pdfIn PDF document text
    • http://gomelavto.by/images/freespinandcoin-blogspot-coin-master_GM406889139.pdfIn PDF document text
    • http://gomelavto.by/images/coin-master-daily-spin-free_GM406889139.pdfIn PDF document text
    • http://gomelavto.by/images/coin-master-hack-xyz-download-free_GM406889139.pdfIn PDF document text
    • http://gomelavto.by/images/free-robux-codes-2021-real_GM431946152.pdfIn PDF document text
    • http://gomelavto.by/images/free-coins-and-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://gomelavto.by/images/free-robux-group-payouts_GM431946152.pdfIn PDF document text
    • http://gomelavto.by/images/free-coin-master-cards_GM406889139.pdfIn PDF document text
    • http://gomelavto.by/images/coin-master-app-for-free-spins_GM406889139.pdfIn PDF document text
    • http://gomelavto.by/images/codes-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://gomelavto.by/images/free-coins-and-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://gomelavto.by/images/minecraft-that-you-can-play-for-free_GM479516143.pdfIn PDF document text
    • http://gomelavto.by/images/coin-master-free-cards-link_GM406889139.pdfIn PDF document text
    • http://gomelavto.by/images/minecraft-for-laptop-free_GM479516143.pdfIn PDF document text
    • http://gomelavto.by/images/get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://gomelavto.by/images/minecraft-dungeons-free_GM479516143.pdfIn PDF document text
    • http://gomelavto.by/images/coin-master-free-spins-cheat_GM406889139.pdfIn PDF document text
    • http://gomelavto.by/images/coin-master-free-coins-and-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004605.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4605 25332 bytes
SHA-256: fb986630129835620eb70a1658c41a825e4230325ee0142e4a8bdbe788150993
font_01_sfnt_off00007f52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F52 17876 bytes
SHA-256: c4ff47951e1088ebfa6fee4158ec4a4a8e96ec6fafbade11010d5ee59fd5f115

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