Malicious PDF — malware analysis report

Static analysis result for SHA-256 431acb03d706a41a…

MALICIOUS

PDF

45.2 KB Created: 2021-05-19 17:03:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: ba370384843c7d0b16ebcd8ade1f4a31 SHA-1: 97463b72f8d1c739f70bc65f2c6decf97888d51e SHA-256: 431acb03d706a41ae6f875cc21e49c4883e0075a680bdc6ce3b0115adadbc411
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, specifically advertising 'game hacks' and 'free generators' for popular games. The document body and embedded links strongly suggest a social engineering lure to drive traffic to potentially malicious websites. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9621

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/coin-master-free-spin-link-today-50-game-hack In PDF document text
    • http://sudamericarural.org/images/infinite-robux_GM431946152.pdfIn PDF document text
    • http://sudamericarural.org/images/how-do-i-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://sudamericarural.org/images/how-to-get-free-hats-on-roblox_GM431946152.pdfIn PDF document text
    • http://sudamericarural.org/images/coin-master-server-hack_GM406889139.pdfIn PDF document text
    • http://sudamericarural.org/images/hacks-para-coin-master_GM406889139.pdfIn PDF document text
    • http://sudamericarural.org/images/free-coins-and-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://sudamericarural.org/images/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://sudamericarural.org/images/robux-fun-hack_GM431946152.pdfIn PDF document text
    • http://sudamericarural.org/images/free-spins-and-coins-blogspot-coin-master_GM406889139.pdfIn PDF document text
    • http://sudamericarural.org/images/free-roblox-hack_GM431946152.pdfIn PDF document text
    • http://sudamericarural.org/images/free-robux-groups-2021_GM431946152.pdfIn PDF document text
    • http://sudamericarural.org/images/cheats-for-coin-master_GM406889139.pdfIn PDF document text
    • http://sudamericarural.org/images/coin-master-gold-cards-free_GM406889139.pdfIn PDF document text
    • http://sudamericarural.org/images/free-robux-with-no-survey_GM431946152.pdfIn PDF document text
    • http://sudamericarural.org/images/free-coin-coin-master_GM406889139.pdfIn PDF document text
    • http://sudamericarural.org/images/pokemon-go-free-team-medallion_GM1094591345.pdfIn PDF document text
    • http://sudamericarural.org/images/make-your-own-minecraft-server-free_GM479516143.pdfIn PDF document text
    • http://sudamericarural.org/images/coin-master-attack-madness-hack_GM406889139.pdfIn PDF document text
    • http://sudamericarural.org/images/roblox-hack-unlimited-robux_GM431946152.pdfIn PDF document text
    • http://sudamericarural.org/images/free-spins-coin-master-links_GM406889139.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_off000049c9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49C9 24712 bytes
SHA-256: bda928daefaa277378dd621afc10ce9b42d2c35c6cef64eea75bfca5a67ca195
font_01_sfnt_off0000828c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x828C 2896 bytes
SHA-256: c1a618813a64314343402b2ec738fc11c4c912460a4c7ae3029924d2f9a229cd
font_02_sfnt_off00008c72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C72 18716 bytes
SHA-256: 34d71a1e16074585b92cedabb87dd12f76b262856d377b8410846490f9b2f930