Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1e8ffa0b11d6854…

MALICIOUS

PDF

34.5 KB Created: 2021-07-05 11:22:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 36aaaaf3127a439858a363481aa96048 SHA-1: 7fead1f26c28fd6b97f5c77fb095b49ab03de633 SHA-256: f1e8ffa0b11d6854eaec552374cb4b77de201f503dc214c40668d2f4104047c7
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple heuristics indicating it is a malicious redirector, specifically luring users with promises of 'free generator / game hack' content. The primary malicious URL identified is http://netcdn.tw/app/431946152/free-robux-websites-that-work-game-hack, which is linked to known malicious infrastructure. The document body, though partially corrupted, reinforces the lure of free game items and includes the same redirector URL. No scripts were extracted, but the overall pattern suggests a phishing or malware distribution attempt.

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/free-robux-websites-that-work-game-hack In PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/get-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/avatar-de-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/roblox-free-models_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/free-membership-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/coin-master-pro-hack_GM406889139.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/pokemon-go-free-daily-remote-pass_GM1094591345.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/how-to-get-free-spins-on-coin-master-2021-ios_GM406889139.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/how-to-downgrade-minecraft-pe_GM479516143.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/lynx-hack-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/cheats-codes-roblox-treasure-hunt-simulator_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/how-to-cheat-theme-park-tycoon-2-on-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/how-do-u-hack-the-power-plant-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/coin-master-spin-link-free-download_GM406889139.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/free-coins-coin-master-no-human-verification_GM406889139.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/how-to-get-everything-in-eletric-state-roblox-hack_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/how-to-hack-prison-life-20-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/get-free-robux-now_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/tiktok-free-view-quest_GM835599320.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/coin-master-free-coins-and-spins-2021_GM406889139.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/what-is-robux-in-roblox_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_off00002fbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FBE 22068 bytes
SHA-256: 72c58e77a98e943f6becc5476e749186c9be3e79b3188166a39e1554f741d7f3
font_01_sfnt_off000060a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60A4 19472 bytes
SHA-256: bfabc7e6efd8369602acc342ff88857307d2346fa8526096ff81aa8b1deb03d6

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