Malicious PDF — malware analysis report

Static analysis result for SHA-256 38bab0abd73126eb…

MALICIOUS

PDF

46.3 KB Created: 2021-06-10 18:00:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 06d05c01810a2ef964588aea6c78f0b7 SHA-1: 08642313cc627301ff18cd5860a60261c0f1d48a SHA-256: 38bab0abd73126eb944ff330f24938b0ec829e8783d29171a150a821ed39fca7
200 Risk Score

Malware Insights

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

The PDF document contains a fake CAPTCHA lure and a link to a known malicious redirector, designed to trick users into visiting a site that likely hosts further malicious content or exploits. The ML classifier also flagged this PDF as malicious. The embedded URL, https://netcdn.tw/app/431946152/gift-free-robux-game-hack, is the primary indicator of this malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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/gift-free-robux-game-hack In PDF document text
    • http://lib.uho.ac.id/library/repository/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/how-to-get-minecraft-java-free_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/how-to-get-free-robux-on-iphone_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/roblox-money-hack_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/roblox-group-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/robux-win_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/roblox-but_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/ways-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/free-money-and-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/minecraft-java-hacks_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/como-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-hack-mod-apk_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-free-spins-2021-no-human-verification_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/freespinandcoin_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-game-hunters-club_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/robux-co-hack_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-hack-unlimited-spins-apk-download_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-robux-no-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-800-robux_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/free-roblox-toys_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000050ab.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50AB 28596 bytes
SHA-256: cd58a08091f2506f61dc6ed6c002c2c38b6e2c85ab3be0e7829f1b455a263b34
font_01_sfnt_off000092e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x92E3 18236 bytes
SHA-256: 27bbee55b279df4e2a3f8433084680ad04072d10a034c4b740534e887bed6c19

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