Malicious PDF — malware analysis report

Static analysis result for SHA-256 6100bdffcf934474…

MALICIOUS

PDF

44.3 KB Created: 2021-06-10 18:18:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: ef8860dc9697418e0cc6b34a22289d08 SHA-1: 0999ece785b1489e128715b41dfe26b3878088b3 SHA-256: 6100bdffcf9344743618189a122b9679bb1aee8ff796e2fe8384a991cb6d3c28
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF document contains multiple links that redirect to malicious infrastructure, disguised as game hacks and generators. The presence of a fake CAPTCHA heuristic indicates a social engineering attempt to trick the user into interacting with these links. The primary link identified is https://netcdn.tw/app/431946152/arsenal-roblox-hack-game-hack, which is part of a known malicious redirector chain. This suggests the document is likely a lure for phishing or to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/431946152/arsenal-roblox-hack-game-hack In PDF document text
    • http://perpustakaan.ipts.ac.id/repository/free-coins-on-coin-master-generator_GM406889139.pdfIn PDF document text
    • http://perpustakaan.ipts.ac.id/repository/coin-master-hack-tool-without-human-verification_GM406889139.pdfIn PDF document text
    • http://perpustakaan.ipts.ac.id/repository/javascript-free-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.ipts.ac.id/repository/free-robux-generator-2021-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://perpustakaan.ipts.ac.id/repository/free-spin-coin-master-link-2021_GM406889139.pdfIn PDF document text
    • http://perpustakaan.ipts.ac.id/repository/how-to-get-free-robux-on-computer_GM431946152.pdfIn PDF document text
    • http://perpustakaan.ipts.ac.id/repository/pokemon-go-free-account-2021_GM1094591345.pdfIn PDF document text
    • http://perpustakaan.ipts.ac.id/repository/coin-master-fan-page-free-spins_GM406889139.pdfIn PDF document text
    • http://perpustakaan.ipts.ac.id/repository/coinmaster-gps-user-review-coinmaster-coin-master-hack-pagedemo-index_GM406889139.pdfIn PDF document text
    • http://perpustakaan.ipts.ac.id/repository/robux-websites-that-work_GM431946152.pdfIn PDF document text
    • http://perpustakaan.ipts.ac.id/repository/coin-master-free-spins-link-today-facebook_GM406889139.pdfIn PDF document text
    • http://perpustakaan.ipts.ac.id/repository/how-to-get-free-tiktok-fans-without-human-verification_GM835599320.pdfIn PDF document text
    • http://perpustakaan.ipts.ac.id/repository/robux-gift-card-free_GM431946152.pdfIn PDF document text
    • http://perpustakaan.ipts.ac.id/repository/how-to-get-free-robux-without-robot-verification_GM431946152.pdfIn PDF document text
    • http://perpustakaan.ipts.ac.id/repository/roblox-hack-unlimited-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.ipts.ac.id/repository/free-roblox-hack_GM431946152.pdfIn PDF document text
    • http://perpustakaan.ipts.ac.id/repository/what-is-a-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.ipts.ac.id/repository/free-promo-codes-for-coin-master_GM406889139.pdfIn PDF document text
    • http://perpustakaan.ipts.ac.id/repository/coin-master-hack-ios-12_GM406889139.pdfIn PDF document text
    • http://perpustakaan.ipts.ac.id/repository/is-pokemon-go-free-on-ipad_GM1094591345.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
stream_004_off000050ed.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50ED 25032 bytes
SHA-256: fedaaa00392ada7b697671698fda6fa6d65afa0085a33ce497678b016189e132
font_01_sfnt_off00008ad5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8AD5 18184 bytes
SHA-256: 1f04cfd173b9e26d6ebcca0989fa66b9a515076b6e6ad4ff4304883b866af6b1

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