Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e4b81f94abe618f…

MALICIOUS

PDF

34.6 KB Created: 2021-07-05 19:43:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: d2f37fe7fb31db7b121814758b71c8a9 SHA-1: 12613a7a9b61023eaa1174fc4c935451e02cb2e9 SHA-256: 3e4b81f94abe618f068949c109d7f593727c11cb9a9ecb7bb3849b82db078ce0
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to redirector infrastructure, specifically advertising 'game hacks' and 'free coins'. The primary link, http://netcdn.tw/app/406889139/clean-master-hack-coins-game-hack, is identified as a malicious redirector. The presence of these links and the lure of free in-game items strongly suggest a phishing or malware distribution attempt, likely using a spearphishing attachment as the initial access vector.

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/clean-master-hack-coins-game-hack In PDF document text
    • http://library.forda-mof.org/katalog/repository/roblox-hack-tool-android_GM431946152.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/coin-free-master_GM406889139.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/robux-hack-free-robux_GM431946152.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/coin-master-free-2021-spin-link_GM406889139.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/free-spins-and-coins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/how-to-downgrade-minecraft-pe_GM479516143.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/roblox-prison-life-hack_GM431946152.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/roblox-super-jump-hack-cheat-engine_GM431946152.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/roblox-arsenal-hacks-download_GM431946152.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/freerubux_GM431946152.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/how-to-hack-in-roblox-2021-mac_GM431946152.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/how-to-make-your-own-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/free-robux-no-anti-bot-verification_GM431946152.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/free-robux-watch-add-to-get-robux_GM431946152.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/how-to-get-free-robux-easy-mobile_GM431946152.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/free-robux-live_GM431946152.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/minecraft-java-edition-code-free_GM479516143.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/mathep_GM431946152.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/free-roblox-hair-to-wear_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_off000032b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x32B7 22600 bytes
SHA-256: c8d3df1255798cf4a29f706d5de52ecec51de6327bd72b3d6dbc751ef70c04ac
font_01_sfnt_off00006504.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6504 18080 bytes
SHA-256: b792ad526cad4bfc6d994df976046642af0b8644436a9d4070e4c0c5b63ed45e

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