Malicious PDF — malware analysis report

Static analysis result for SHA-256 94c31fa58aeb2c98…

MALICIOUS

PDF

34.6 KB Created: 2021-07-05 08:48:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: aba54e882230578f03697df28a701423 SHA-1: 2b0b12409cce95603fe99088966c4d3ce5e888bd SHA-256: 94c31fa58aeb2c986bc2a53404a13452a75ff92e6b3be58bd300d39c77658a7a
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a lure of free game currency and cheats to entice users into clicking malicious links. It contains numerous links to redirectors and a link farm, suggesting an attempt to drive traffic to potentially harmful sites. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/431946152/rewardrobux-com-game-hack In PDF document text
    • http://www.pspmrsmmbk.com/cendana//repository/coin-master-key-free-spin_GM406889139.pdfIn PDF document text
    • http://www.pspmrsmmbk.com/cendana/repository/roblox-cheat-engine-patched_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmmbk.com/cendana/repository/how-to-get-it-free-robux_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmmbk.com/cendana/repository/coin-master-free-online_GM406889139.pdfIn PDF document text
    • http://www.pspmrsmmbk.com/cendana/repository/admin-code-for-free-robux_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmmbk.com/cendana/repository/minecraft-116-apk-download_GM479516143.pdfIn PDF document text
    • http://www.pspmrsmmbk.com/cendana/repository/call-roblox-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmmbk.com/cendana/repository/coin-master-free-link-today_GM406889139.pdfIn PDF document text
    • http://www.pspmrsmmbk.com/cendana/repository/i-didnt-get-my-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://www.pspmrsmmbk.com/cendana//repository/free-spin-link-coin-master_GM406889139.pdfIn PDF document text
    • http://www.pspmrsmmbk.com/cendana/repository/how-to-make-your-own-dominus-in-roblox-free_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmmbk.com/cendana/repository/how-to-get-202100-robux-for-free-roblox_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmmbk.com/cendana/repository/how-to-hack-roblox-on-mac_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmmbk.com/cendana/repository/gamehunters-club-coin-master_GM406889139.pdfIn PDF document text
    • http://www.pspmrsmmbk.com/cendana/repository/hacks-para-roblox-booga-booga-2021_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmmbk.com/cendana/repository/for-creeper-hack-roblox_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmmbk.com/cendana/repository/free-coins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://www.pspmrsmmbk.com/cendana/repository/minecraft-logo-maker-free_GM479516143.pdfIn PDF document text
    • http://www.pspmrsmmbk.com/cendana/repository/coin-master-free-daily-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://www.pspmrsmmbk.com/cendana//repository/try-coin-master-hack_GM406889139.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_off00003109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3109 22040 bytes
SHA-256: 17be50edac1dc8c8fdc600795f7d4e5c63ba4328fb50c92dcfc750d291f9c6de
font_01_sfnt_off000061d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61D7 19152 bytes
SHA-256: 8897bdbdddddb4c8ea22b3534d777e6870992c4c83dc3d62d7fe7b9be2d9a1da

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