Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a7fe05ded1956bb…

MALICIOUS

PDF

44.2 KB Created: 2021-06-03 23:56:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 7bf57e229785d100b57319e9322039c5 SHA-1: 0ad6b6a7d3e35a3f7c4e766fe315f3630f485c9a SHA-256: 5a7fe05ded1956bbe98c81d2028484541a124ca19093d9b544f7822a128d3040
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a lure for a "free generator / game hack" which redirects to malicious infrastructure. The document body and embedded links suggest a social engineering attempt to trick users into visiting a potentially harmful site. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate a malicious redirector chain.

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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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/instantrobux-game-hack In PDF document text
    • http://library.fk.upnvj.ac.id/repository/how-to-get-free-robux-on-ipad_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/free-apk-mod-coin-master_GM406889139.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/minecraft-education-edition-free_GM479516143.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/minecraft-bedrock-edition-pc-download-free_GM479516143.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/free-robux-working_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/coin-master-daily-free-rewards_GM406889139.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/free-robux-obby-2021_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/games-like-bloxbutg-in-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/coin-master-gold-cards-free-2021_GM406889139.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/how-to-cheat-in-roblox_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/boost9-com-roblox-hack_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/coin-master-links-for-today_GM406889139.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/free-coins-and-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/free-coin-master-gift-link_GM406889139.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/100-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/coin-master-hack-version_GM406889139.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/free-robux-on-phone_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/free-robux-images_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/tiktok-free-fans-2021_GM835599320.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/how-to-get-free-roblox_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_004_off00004e59.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4E59 26168 bytes
SHA-256: 588ba69f89e7c5850c0eedda23533735a414252969112218c8d2f9b00720f66f
font_01_sfnt_off00008a10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A10 18184 bytes
SHA-256: 4d77632c85c001e266779ad9698d54220e11b78bd17d8b0f085f3dc4dd17180b

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