Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8195b597263e327…

MALICIOUS

PDF

50.0 KB Created: 2021-06-03 18:18:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 452960302e13d02b8b71b8226ade2587 SHA-1: a2adb29e32279dd3221c8427902877c2f82a921a SHA-256: c8195b597263e327eea99fb21d6588a009f4c3bc1f77d5de330f58c7634fc17b
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are SEO-optimized PDFs, and one critical link points to known malicious redirector infrastructure. The document body and heuristics indicate a lure for game hacks and free currency, suggesting a phishing or malware distribution attempt. No scripts were extracted, but the embedded links are the primary indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

Heuristics 5

  • 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.online/app/406889139/coin-master-hacks-for-android-game-hack In PDF document text
    • http://lib.fisipumt.ac.id/repository/free-robux-no-anti-bot-verification_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/coin-master-free-gift-links-2021_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/hack-coin-master-xyz_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/how-to-hack-a-roblox-account-easy_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/how-to-cheat-in-roblox_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/coin-master-hacks-for-gold-cards_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/coin-master-free-spins-and-coins-daily-links_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/coin-master-card-hack-app_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/june-29-coin-master-hack-no-human-verification_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/android-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/minecraft-bedrock-edition-free-with-java_GM479516143.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/free-spins-and-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/how-to-get-free-gold-cards-on-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/coin-master-34-6-hack_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/robux-gift-card-free_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/apps-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/pubg-uc-online-generator_GM1330123889.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/robux-free-2021_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/minecraft-free-download-no-virus_GM479516143.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/hacks-para-roblox_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000052e0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52E0 30432 bytes
SHA-256: f4ee6f53b2a21e08c5dca8f9cc4c78a7707ce8b9e0dd6de3b3896fa9c3c31d1b
font_01_sfnt_off0000967c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x967C 3172 bytes
SHA-256: 57d00666f6c704ee873b9b0dfb95dd28436fdeb3ca8408dc505ae0e61958f771
font_02_sfnt_off0000a18e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA18E 18056 bytes
SHA-256: 59174fbff90841f3d82b951a67024dd49c53f2706d138598019600dd1f76f1a3

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