Malicious PDF — malware analysis report

Static analysis result for SHA-256 dab3239944fddd21…

MALICIOUS

PDF

35.6 KB Created: 2021-07-06 06:01:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 908f621b3ea81d0a336ad419372f875b SHA-1: 4077cbc16620afdebb7164fb509c869aa7254897 SHA-256: dab3239944fddd2103aece2d5e001def7ee40f749962c02c81d9170b5635baf0
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to websites offering game hacks and free currency, a common lure for phishing or malware distribution. One critical heuristic identified a link to known malicious redirector infrastructure, specifically http://netcdn.tw/app/406889139/coin-master-new-link-free-spin-game-hack. While no scripts were directly extracted, the presence of embedded URLs and the nature of the lures suggest an attempt to redirect the user to a malicious site, likely for further exploitation.

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/406889139/coin-master-new-link-free-spin-game-hack In PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/how-to-get-free-robux-on-computer_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/coin-master-spin-hack-link_GM406889139.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/cheats-for-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/free-minecraft-maps-pe_GM479516143.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/free-spins-on-coin-master-cheat_GM406889139.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/pain-exist-roblox-jailbreak-hack_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/coin-master-raid-hack_GM406889139.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/links-to-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/can-u-get-free-robux-in-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/robux-website_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/script-roblox-hack_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/roblox-best-free-exploit-march-2021_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/roblox-e-free-command_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/minecraft-free-trial_GM479516143.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/how-2-hack-roblox-for-robux_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/free-robux-no-verification-at-all_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/coin-master-game-free-spin-download_GM406889139.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/roblox-hack-no-key_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/free-roblox-plane-models_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/roblox-hacker-look_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_off0000356e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x356E 22640 bytes
SHA-256: 14e753591c2fed918e4ce63fd342ed893595e0fb03d7ac8d95f172d7f65dad2a
font_01_sfnt_off000067de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67DE 18508 bytes
SHA-256: 79b9a27d0053041ad6906645aa4faf6565b34a6988944d829044528d7b2e3163

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