Malicious PDF — malware analysis report

Static analysis result for SHA-256 aff168e9f37ee59c…

MALICIOUS

PDF

42.8 KB Created: 2021-05-10 13:33:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 1c1144051c661447cad4963d5750d4d5 SHA-1: 56c33f49ab4a9607214735fed60e871c1627d531 SHA-256: aff168e9f37ee59cd9ce40d87c213ac7e62bba569624cf77f1b97705000a4417
340 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document employs social engineering tactics, presenting a fake CAPTCHA and a lure for game hacks to trick the user into clicking a malicious link. The link redirects to infrastructure known for hosting malicious content, suggesting a phishing or malware distribution attempt. No scripts were extracted, but the PDF's structure and embedded URLs strongly indicate a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 8

  • 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 with command-running instructions critical SE_FAKE_CAPTCHA_CLICKFIX
    Document combines fake CAPTCHA or human-verification language with instructions to paste or run a command — a high-confidence ClickFix pattern
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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/479516143/best-free-minecraft-hacked-client-game-hack In PDF document text
    • http://lib.pps.uin-suka.ac.id/repository/download-hack-coin-master-apk_GM406889139.pdfIn PDF document text
    • http://lib.pps.uin-suka.ac.id/repository/how-to-download-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://lib.pps.uin-suka.ac.id/repository/free-gold-cards-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.pps.uin-suka.ac.id/repository/daily-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.pps.uin-suka.ac.id/repository/coin-master-daily-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://lib.pps.uin-suka.ac.id/repository/coin-master-free-spins-2021-apk_GM406889139.pdfIn PDF document text
    • http://lib.pps.uin-suka.ac.id/repository/coin-master-free-spins-and-coins-daily-links_GM406889139.pdfIn PDF document text
    • http://lib.pps.uin-suka.ac.id/repository/minecraft-for-ps3-free_GM479516143.pdfIn PDF document text
    • http://lib.pps.uin-suka.ac.id/repository/coin-master-free-spin-27_GM406889139.pdfIn PDF document text
    • http://lib.pps.uin-suka.ac.id/repository/freespinandcoin-blogspot-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.pps.uin-suka.ac.id/repository/hack-coin-master-android_GM406889139.pdfIn PDF document text
    • http://lib.pps.uin-suka.ac.id/repository/coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://lib.pps.uin-suka.ac.id/repository/free-coin-spin-daily-link-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.pps.uin-suka.ac.id/repository/free-minecraft-gift-card_GM479516143.pdfIn PDF document text
    • http://lib.pps.uin-suka.ac.id/repository/coin-master-free-chest-link_GM406889139.pdfIn PDF document text
    • http://lib.pps.uin-suka.ac.id/repository/how-to-hack-coin-master-apple_GM406889139.pdfIn PDF document text
    • http://lib.pps.uin-suka.ac.id/repository/coin-master-attack-hack-apk_GM406889139.pdfIn PDF document text
    • http://lib.pps.uin-suka.ac.id/repository/clean-master-hack-coins_GM406889139.pdfIn PDF document text
    • http://lib.pps.uin-suka.ac.id/repository/minecraft-java-account-free_GM479516143.pdfIn PDF document text
    • http://lib.pps.uin-suka.ac.id/repository/minecraft-xbox-360-free_GM479516143.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_off00004d74.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4D74 24648 bytes
SHA-256: 050205e2a401451b676d0138a41b80a85a15e637a45ee0ed3f572370f6d9df56
font_01_sfnt_off0000858e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x858E 18200 bytes
SHA-256: dee6b3909f49c7ddbb1ab18ee008f1775ca59041fcbdd753e186a80ce5ffdd4d

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