Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f4643af82782190…

MALICIOUS

PDF

34.2 KB Created: 2021-07-03 15:24:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 2c890a365781ad953d742034d36cedb2 SHA-1: 393817ab454eafb0cdabaebc31069999ccd31330 SHA-256: 2f4643af8278219035bbba70f701892880327701f585fccf05af1fde09971776
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting game hacks and cheats. The primary lure URL is http://netcdn.tw/app/406889139/coin-master-free-spin-ml-game-hack, which is flagged as a malicious redirector. The document body and numerous embedded URLs reinforce this theme of luring users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • 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 http://netcdn.tw/app/406889139/coin-master-free-spin-ml-game-hack In PDF document text
    • http://lib.smklabor.sch.id/repository/roblox-redeem-codes-free_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/free-robux-promo-cides_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/free-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/robux-fun-robux-hack_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/roblox-fling-hack_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/how-to-cheat-ninja-assassin-in-roblox_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/codigos-paa-hackear-roblox_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/roblox-how-to-get-any-gamepass-free-not-patched_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/free-russian-sign-roblox-t-shirt_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/how-do-u-hack-roblox_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/teleport-roblox-jilbreak-hack_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/how-to-actually-fly-hack-n-roblox-fe2_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/hacking-scripts-to-hack-roblox-gamemodes_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/fre-robux-for-roblox_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/coin-master-free-coins-and-spins-2021_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/free-robux-websites-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/coin-master-spins_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/free-pet-treats-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/roblox-com-roblox-play-now-for-free_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/bux-gg-robux-free_GM431946152.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_002_off00002f46.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2F46 23088 bytes
SHA-256: 566ecbcf9e43155dca573c83fcc303868cdf37f987821f2faf19dd811ce6759b
font_01_sfnt_off000062ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62FF 18248 bytes
SHA-256: c18038b999a15e068e0fcec6b3cb299d21e05aa15a09c32d3b19c8c95a871ee0

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