Malicious PDF — malware analysis report

Static analysis result for SHA-256 273f74b106a89253…

MALICIOUS

PDF

42.7 KB Created: 2021-05-16 01:33:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 25bf015df79f1ab2592337cc439e2fff SHA-1: f3e09cc774ae375401d69a72e88ea9551196c8e0 SHA-256: 273f74b106a89253cdcdb0fad190f2bac13352a4e638d919dfcc8663263112d9
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to a known malicious redirector infrastructure, specifically advertising 'free Robux codes' and 'game hacks'. The presence of a fake CAPTCHA heuristic further suggests a social engineering attempt to trick the user into interacting with the malicious content. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.xyz/app/431946152/how-to-get-free-robux-codes-game-hack In PDF document text
    • https://library.iuli.ac.id/repository/minecraft-life-hacks_GM479516143.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/coin-master-cheats-free_GM406889139.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/free-minecraft-skins-ps4_GM479516143.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/coin-master-free-spins-and-coins-blogspot_GM406889139.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/mcpe-master-hack-unlimited-coins-download_GM406889139.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/moonactive-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/free-spins-coin-master-links-no-human-verification_GM406889139.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/free-robux-gift-card-codes-2021_GM431946152.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/coin-master-2021-free-spins_GM406889139.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/robux-link_GM431946152.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/free-spins-and-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/coin-master-free-spin-codes_GM406889139.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/instant-robux_GM431946152.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/how-to-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/funbloxxyz-free-robux_GM431946152.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/minecraft-pe-015-0-apk-free-download_GM479516143.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/free-robux-generator-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/get-me-free-robux_GM431946152.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/what-is-coin-master_GM406889139.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/roblox-controversy_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
stream_003_off000045e7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x45E7 27404 bytes
SHA-256: 3a960fb2b05b185f6cc30c5e454467cd6f7665af3ccc139d28f9058ce019672e
font_01_sfnt_off000083d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83D5 18456 bytes
SHA-256: 647704a1f8ac96c456e26df3796ee2ada4959e42324ca69004a5f2968b1e2bf7

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