Malicious PDF — malware analysis report

Static analysis result for SHA-256 339e0d449df6a866…

MALICIOUS

PDF

44.1 KB Created: 2021-06-03 11:11:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 5ea4c39071d050a0eeb7d330e65a9320 SHA-1: 0f9b80bf40325252878916b6ee7e0c8bc32ca1af SHA-256: 339e0d449df6a866953feca8b2e254031b3d41456c3e062e4debb542e4fdde45
200 Risk Score

Malware Insights

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

The PDF contains a link to a malicious redirector disguised as a game hack generator, which is a common lure for phishing or malware distribution. The document body and heuristics indicate a fake CAPTCHA or human verification prompt, likely intended to trick the user into executing further malicious actions or downloading a payload. No scripts were extracted, but the presence of embedded URLs and the nature of the lure suggest a phishing or social engineering attack.

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.online/app/431946152/claimrobux-net-game-hack In PDF document text
    • http://digilib.stiki.ac.id/repository/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/best-roblox-hacks_GM431946152.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/free-robux-not-a-scam_GM431946152.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/how-to-get-free-robux-without-email_GM431946152.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/coin-master-spins-hack-2021_GM406889139.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/how-to-install-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/how-to-get-free-robux-without-any-verification_GM431946152.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/bux-life-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/free-robux-kid-friendly_GM431946152.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/which-pubg-uc-is-best_GM1330123889.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/claimrobux-net_GM431946152.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/minecraft-realms-free_GM479516143.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/how-to-hack-roblox-to-get-robux_GM431946152.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/password-free-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/free-vip-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/minecraft-windows-10-edition-free-with-java_GM479516143.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/codes-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/windows-10-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/hack-coin-master-apk-2021_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
stream_004_off00004e5d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4E5D 25288 bytes
SHA-256: ac915fc9378fd4d7246de2e3e38528b5aefe7b03b345d4939866705c59e1cb0b
font_01_sfnt_off000088b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x88B1 18636 bytes
SHA-256: fed7017d40692eac1ff316f746102d56b5c33121c7e16a07ced3a5c1d581b242

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