Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c9d1c5c69b740bd…

MALICIOUS

PDF

34.4 KB Created: 2021-07-04 19:29:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: dbc6ce8b18b5a442fb24c48a458836ff SHA-1: 51e3d94f56a8f664556a5f1cf7ae6444201800fc SHA-256: 8c9d1c5c69b740bd172b3caa2d6e3b557506dcd9f6d23c6d36b54cead8b40604
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, masquerading as game hacks or generators. The primary lure URL is http://netcdn.tw/app/431946152/blox-land-free-robux-game-hack. The document body and heuristics indicate a social engineering tactic to trick users into visiting these sites, likely for further malware delivery or credential harvesting.

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/431946152/blox-land-free-robux-game-hack In PDF document text
    • http://lib.stimykpn.ac.id/repository/what-website-to-get-free-robux-ant_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/tweakbox-roblox-hack_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/100-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/how-to-get-easy-robux-for-free_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/how-to-get-robux-for-free-on-bowser_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/how-do-you-get-free-robux-on-tablet_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/bad-minecraft-free_GM479516143.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/coin-master-hack-spin-160-pro_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/how-to-use-cheat-engine-on-roblox-august-2021_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/comment-activer-cheat-code-roblox_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-points-robux_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-download-roblox-game-for-pc_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/how-to-get-free-robux-on-roblox-2021-fast_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-robux-claim-your-reward_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/apocalypse-rising-roblox-cheats_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/good-free-minecraft-server-hosting_GM479516143.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/how-to-get-free-robux-legit-computer_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/roblox-free-fall-damage-reddit_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/hacking-into-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-arsenal-hacks_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_off00002fbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FBF 22408 bytes
SHA-256: db0efb133cc44d3b4769953ff6f56de05f76f3336b94a886f5bd244583fb81af
font_01_sfnt_off000061b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61B4 18964 bytes
SHA-256: 3f12ef93e3f94e19068a8415642f40f3a4d95b4d38f37f1bdada02c05cec8b59