Malicious PDF — malware analysis report

Static analysis result for SHA-256 1634ec962e01f704…

MALICIOUS

PDF

34.5 KB Created: 2021-07-06 14:13:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 2300eb0867ed55e8fd978c6fb311551a SHA-1: da172f96b6dde66da6ace7e5b2fe5feb081ca9e5 SHA-256: 1634ec962e01f7041fa4da7351b0db0cc902a6b4e3bec9505f31fbd36047bd70
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded URLs that lead to a known malicious redirector infrastructure, specifically http://netcdn.tw/app/431946152/free-exploits-for-roblox-game-hack. The document body and heuristics indicate a lure for game hacks and free items, designed to trick users into clicking the malicious links. No scripts were extracted from this sample, but the presence of malicious redirectors and the lure strongly suggest 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-exploits-for-roblox-game-hack In PDF document text
    • http://perpus.stfm.ac.id/repository/roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/free-robux-for-kids-no-verification_GM431946152.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/free-roblox-promo-codes-for-robux_GM431946152.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/robuxmatchcom-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/free-daily-spins-and-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/roblox-robux-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/free-minecraft-skin-packs_GM479516143.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/how-to-hack-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/coin-master-facebook-hack_GM406889139.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/coin-master-hoe-to-get-extra-free-spins_GM406889139.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/robux-codes_GM431946152.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/coin-master-free-spins-today-daily-links_GM406889139.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/twitter-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/free-robux-master_GM431946152.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/minecraft-client-download_GM479516143.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/ro-ghoul-script_GM431946152.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/roblox-free-tbc-account_GM431946152.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/roblox-free-robux-no-survey-2021_GM431946152.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/pokemon-go-free-avatar-items_GM1094591345.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/how-to-get-free-coins-and-spins-on-coin-master_GM406889139.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_off00002def.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2DEF 23104 bytes
SHA-256: fcb370fd9d8c03fe94e85f251b2a0f847cea2000e3f0f675f0170d891c6a2f24
font_01_sfnt_off000061ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61ED 19048 bytes
SHA-256: 8972ce61ac0675ac16da68eab1f4f783fddbc9932eaa3946beb9ca390a13086b

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