Malicious PDF — malware analysis report

Static analysis result for SHA-256 115dbaa8c9e59d41…

MALICIOUS

PDF

47.4 KB Created: 2021-06-10 20:50:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: dbe2c04e85868dee842782b3621f094f SHA-1: 024eac1291843278ea6fad9b3151f8f38b999b86 SHA-256: 115dbaa8c9e59d419145b140f097105deb75eebb115ca186fd12db8184b438a1
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a lure of free game hacks and generators to entice users into clicking malicious links. The document contains numerous links to redirector infrastructure, which in turn point to further PDF lures. The primary malicious URL identified is https://netcdn.tw/app/479516143/free-texture-packs-for-minecraft-pe-game-hack, which is part of a link farm designed to attract traffic. No scripts were extracted, but the document's structure and embedded links strongly suggest a phishing or malware distribution workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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 https://netcdn.tw/app/479516143/free-texture-packs-for-minecraft-pe-game-hack In PDF document text
    • http://pustaka.bbppketindan.info/repository/minecraft-hacks-ps4_GM479516143.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/how-to-get-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/minecraft-account-hacked_GM479516143.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/free-spins-coin-master-app_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/get-coin-master-spins-free_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/minecraft-free-trial_GM479516143.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/free-robux-no-survey-or-human-verification_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/how-to-hack-roblox-2021-december_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/how-to-get-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/minecraft-free-download-windows_GM479516143.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/coin-master-free-spins-5-10-2021_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/free-robux-not-a-scam_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/coin-master-hack-2021-android_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/free-spins-and-coins-coin-master-link-2021_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/how-to-hack-someone-on-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/coin-master-daily-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/2021-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/coin-master-free-spin-ml_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/you-promised-my-son-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/free-coins-for-coin-master_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_004_off000052d4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52D4 25376 bytes
SHA-256: 83e262a3670dae75b4c29dcbcdc417d6c06936d194d8b3a8da68942f1927a8aa
font_01_sfnt_off00008cb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CB1 2820 bytes
SHA-256: 972979c3a46100cf5f8fd289bc6fbd2496ff75fec0e3f6753648c72ec6eba714
font_02_sfnt_off00009651.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9651 18384 bytes
SHA-256: 4bd922cb808520f712e6f68915d55ea385c9bd17e049420b207e71ca6d562f93

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