Malicious PDF — malware analysis report

Static analysis result for SHA-256 c392519e7e40b4c1…

MALICIOUS

PDF

34.1 KB Created: 2021-07-05 05:46:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 54d8e2659aa8a245420ce5886b03af65 SHA-1: d9d3e14250e780e64f57a9abc55c8192fd291b89 SHA-256: c392519e7e40b4c11a35473871bbcc5b7442c3621204bdd67c4044f63d6fb0db
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple links to external websites that are identified as malicious redirectors, specifically promoting 'game hacks' and generators. The primary lure directs users to 'http://netcdn.tw/app/406889139/master-coin-hack-app-game-hack', which likely serves as a download or further redirection point for malware. The ML classifier also strongly indicated maliciousness.

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/master-coin-hack-app-game-hack In PDF document text
    • http://library.forda-mof.org/katalog/repository/coin-master-daily-free-spin-and-coin_GM406889139.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/robux-xyz_GM431946152.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/promodes-free-roblox_GM431946152.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/free-shirt-roblox_GM431946152.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/any-roblox-hacks-for-mac_GM431946152.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/mcpe-116_GM479516143.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/roblox-online-free-no-download_GM431946152.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/free-daily-spins-and-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/coins-master_GM406889139.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/coin-master-raid-hack_GM406889139.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/minecraft-auto-miner-hack_GM479516143.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/como-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/free-robux-safe_GM431946152.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/20-roblox-card-free_GM431946152.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/robloxbux-us-generator_GM431946152.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/free-robux-no-verify_GM431946152.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/how-do-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/roblox-hack-site-simplesite_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
font_00_sfnt_off000030fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30FB 22332 bytes
SHA-256: 569375163786aef0a4ae416461a6ea76f60b5e2331c7b57f05c4e109fc3f7a1c
font_01_sfnt_off000062ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62AE 18180 bytes
SHA-256: 7bd10482523747762d14b11b19cc03829bec2525ea32b9abd6d12ec6249f4c5e

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