Malicious PDF — malware analysis report

Static analysis result for SHA-256 20482251a0a3c940…

MALICIOUS

PDF

45.7 KB Created: 2021-06-04 01:20:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: fc5121c4a8618e9537d69ed25b903a7c SHA-1: 69a348887f45422fdf072b9a0e7de235ff374b62 SHA-256: 20482251a0a3c94027113a2411891e65c0f687d80b6c1ea75e77d7c1133369ce
200 Risk Score

Malware Insights

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

The PDF contains multiple links to known malicious redirectors, specifically promoting game hacks and free spins for games like Coin Master. The document body, though partially obfuscated, also contains these URLs and suggests a password-protected archive handoff, a common tactic to bypass security filters. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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/free-spin-coin-master-game-game-hack In PDF document text
    • http://suaedy-library.net/repository/minecraft-pe-free_GM479516143.pdfIn PDF document text
    • http://suaedy-library.net/repository/free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://suaedy-library.net/repository/free-spins-coin-master-links-thursday-november-28-2021_GM406889139.pdfIn PDF document text
    • http://suaedy-library.net/repository/free-minecraft-account-and-password-generator_GM479516143.pdfIn PDF document text
    • http://suaedy-library.net/repository/roblox-sued_GM431946152.pdfIn PDF document text
    • http://suaedy-library.net/repository/minecraft-free-reddit_GM479516143.pdfIn PDF document text
    • http://suaedy-library.net/repository/free-robux-for-kids-no-verification_GM431946152.pdfIn PDF document text
    • http://suaedy-library.net/repository/coin-master-time-hack-2021_GM406889139.pdfIn PDF document text
    • http://suaedy-library.net/repository/free-roblox-hack-us_GM431946152.pdfIn PDF document text
    • http://suaedy-library.net/repository/coin-master-free-coins-and-spins-daily_GM406889139.pdfIn PDF document text
    • http://suaedy-library.net/repository/how-to-hack-minecraft_GM479516143.pdfIn PDF document text
    • http://suaedy-library.net/repository/coin-master-free-spins-link-blogspot-2021_GM406889139.pdfIn PDF document text
    • http://suaedy-library.net/repository/get-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://suaedy-library.net/repository/how-to-hack-peoples-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://suaedy-library.net/repository/coin-master-free-spin-and-coin-link-today_GM406889139.pdfIn PDF document text
    • http://suaedy-library.net/repository/coin-master-free-attack-link_GM406889139.pdfIn PDF document text
    • http://suaedy-library.net/repository/roblox-april-fools-hack_GM431946152.pdfIn PDF document text
    • http://suaedy-library.net/repository/free-robux-not-fake_GM431946152.pdfIn PDF document text
    • http://suaedy-library.net/repository/coin-master-free-cards-2021_GM406889139.pdfIn PDF document text
    • http://suaedy-library.net/repository/minecraft-net-free_GM479516143.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_004_off00005143.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5143 27824 bytes
SHA-256: f431ad475b4c203ff5f59bc82484fc3f0716ec90dacf482467fc1bb4dff66742
font_01_sfnt_off000090c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x90C8 18148 bytes
SHA-256: 05f474a5dd778b1a8f82bb3f3194e0f6909204339d3dcef5442e6da61b36e890

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