Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f942473fa061a20…

MALICIOUS

PDF

48.3 KB Created: 2021-05-12 17:32:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 805f6398934443500dc5a69fab95fef0 SHA-1: 3ba15e7ba060caa8021de947755ce0cabc885c77 SHA-256: 9f942473fa061a20286c983157c9de83dabd62470aee796f801e79878aa4cf75
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link to a known malicious redirector infrastructure, disguised as a game hack generator. The document body and embedded URLs suggest a lure for free in-game currency or hacks, which is a common social engineering tactic. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9013

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 https://netcdn.xyz/app/406889139/how-many-levels-are-there-in-coin-master-game-hack In PDF document text
    • http://www.bripi.pl/images/can-you-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://www.bripi.pl/images/wwwhaktutsin-2021-08-coinmasterfreespinandcoinlinkhtml-m-1_GM406889139.pdfIn PDF document text
    • http://www.bripi.pl/images/free-coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • http://www.bripi.pl/images/robux-free-gift-card-org-hack_GM431946152.pdfIn PDF document text
    • http://www.bripi.pl/images/earn-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.bripi.pl/images/coins-master-hack_GM406889139.pdfIn PDF document text
    • http://www.bripi.pl/images/free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://www.bripi.pl/images/coin-master-free-spin-ml_GM406889139.pdfIn PDF document text
    • http://www.bripi.pl/images/free-robux-not-a-scam_GM431946152.pdfIn PDF document text
    • http://www.bripi.pl/images/coin-master-free-spins-may-11-2021_GM406889139.pdfIn PDF document text
    • http://www.bripi.pl/images/new-free-money-links-coin-master_GM406889139.pdfIn PDF document text
    • http://www.bripi.pl/images/coin-master-links-to-free-spins_GM406889139.pdfIn PDF document text
    • http://www.bripi.pl/images/coin-master-free-spins-coins_GM406889139.pdfIn PDF document text
    • http://www.bripi.pl/images/coin-master-hack-2021-ios-download_GM406889139.pdfIn PDF document text
    • http://www.bripi.pl/images/coin-master-hack-mod_GM406889139.pdfIn PDF document text
    • http://www.bripi.pl/images/get-free-robux-info_GM431946152.pdfIn PDF document text
    • http://www.bripi.pl/images/www-roblox-robux_GM431946152.pdfIn PDF document text
    • http://www.bripi.pl/images/how-to-get-free-robux-without-downloading-apps_GM431946152.pdfIn PDF document text
    • http://www.bripi.pl/images/free-robux-thumbnail_GM431946152.pdfIn PDF document text
    • http://www.bripi.pl/images/how-to-hack-a-minecraft-server_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004f20.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F20 25212 bytes
SHA-256: d198a506ad56dc1edefcc9a38c657bcec24805f41d8fe50ae06471656f17e941
font_01_sfnt_off000088aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x88AA 7332 bytes
SHA-256: d811e0aca85f3b94c42cd1240eec68b8eb378f3d8be5e408d3f6abd0f11f834d
font_02_sfnt_off00009ac2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9AC2 18244 bytes
SHA-256: 7a3e09ddd81ff0bf88cf020c99e068e580145ca5d489a9015f3b374a3ae3c451

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