Malicious PDF — malware analysis report

Static analysis result for SHA-256 81afb36d13f2704a…

MALICIOUS

PDF

48.7 KB Created: 2021-06-11 04:36:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: ced8679642f2467ed479fcf92592d242 SHA-1: f360cbcc2e2fba1dcd124085736a550cff03fdc7 SHA-256: 81afb36d13f2704a073b68734302b297e89a716c1e950bf3c82fe9200e6edcb5
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links that redirect to malicious infrastructure, specifically promoting game hacks and generators. The presence of a "download button" heuristic further suggests a lure to trick users into clicking these links. While no scripts were explicitly extracted, the nature of the links and the ML classification indicate a malicious intent to redirect users to potentially harmful content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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 https://netcdn.tw/app/431946152/hacker-day-roblox-game-hack In PDF document text
    • http://elibrary.smknesbu.sch.id/repository/freespinandcoin-blogspot-com_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/coin-master-hack-without-verification-2021_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/safe-hack-for-coin-master-android_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/free-texture-packs-for-minecraft-pe_GM479516143.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/archery-master-3d-apk-and-mod-free-download-unlimited-coins_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/how-to-create-group-in-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/sistem48-hack-roblox_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/roblox-phantom-forces-hack_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/free-coin-master-cards_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/free-robux-kingdom_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/websites-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/united-gaming-net-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/rbx-free-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/free-robux-no-human-verify_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/robloxhacks_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/coin-master-free-spins-and-free-coins_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/free-robux-without-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/get-free-lives-on-coin-master_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/how-do-i-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/is-coin-master-free_GM406889139.pdfIn PDF document text
    • https://www.roblox.comIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005316.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5316 25336 bytes
SHA-256: 3abf041e0aa287abb7f40fef765a815b284d21a6e7294a6a7ca1a47415e09f71
font_01_sfnt_off00008ded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8DED 5596 bytes
SHA-256: 9a13c2580265a78e8a7257496a31ee0055738af7e20a5661c2902efe4bf05ce5
font_02_sfnt_off00009a95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9A95 18532 bytes
SHA-256: fc8bf42d053efe2baf395a77d105fa5fb747aaa649ed83ab87cb42a151cadbc5

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