Malicious PDF — malware analysis report

Static analysis result for SHA-256 51198c91ad5e05ee…

MALICIOUS

PDF

34.2 KB Created: 2021-06-25 22:41:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: b6182e88e59c0779a8daeb4a36bb9056 SHA-1: 6d175db7e73aef1f729dc80ce4fd56a40d435746 SHA-256: 51198c91ad5e05ee51879440185eeab8451a90670222a2e2a2bb87e6f93420d2
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure for free game currency and hacks, which is a common social engineering tactic. It directs users to a malicious redirector URL, identified by multiple heuristics as a known malicious infrastructure. The document body confirms the lure, and the presence of embedded URLs further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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.
  • 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 http://netcdn.co/app/431946152/free-2021-promo-codes-roblox-game-hack In PDF document text
    • https://elibrary.ikhac.ac.id/repository/is-there-a-legal-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/coin-master-daily-rewards_GM406889139.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/roblox-free-robux-limited-edition_GM431946152.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/free-spins-on-coin-master-link_GM406889139.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/hacking-system-for-clothes-on-roblox_GM431946152.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/how-to-download-minecraft-for-free-on-windows_GM479516143.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/invisible-hack-roblox-2021_GM431946152.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/roblox-free-downlow_GM431946152.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/free-robux-only-username_GM431946152.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/free-robux-mobile_GM431946152.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/mobihack-roblox-hack_GM431946152.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/games-to-hack-on-roblox_GM431946152.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/simple-hacks-for-roblox_GM431946152.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/coin-master-spin-hack_GM406889139.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/coin-master-hack-tool-v1-9-apk_GM406889139.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/roblox-free-shirts-and-pants-catalog_GM431946152.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/hack-script-roblox-tuto_GM431946152.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/coin-master-free-spins-april-2021_GM406889139.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/free-robux-without-email_GM431946152.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/coin-master-free-spins-and-coins-link-today_GM406889139.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
font_00_sfnt_off00002e9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E9E 21924 bytes
SHA-256: d168c5d90f2bfa8edd979f90e46790d97e8cf7d8b2ecf786c70eaa7f6503e689
font_01_sfnt_off00005f04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F04 19640 bytes
SHA-256: b8b8db87a972c7cae07715f5e8b645471fa0c907af68401cc7529d8df6af5c35

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