Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b8855c90c8e0701…

MALICIOUS

PDF

33.0 KB Created: 2021-07-06 05:32:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 0e5b4511df5c8297dc975413836383c9 SHA-1: 8e7f2892d5a91979d7753f50925fe5d0b376ac99 SHA-256: 0b8855c90c8e0701b7e8ce041b8bb50a28c07014b0823ca05d90021035c9cbb5
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links, including one to a known malicious redirector at http://netcdn.tw/app/835599320/tiktok-free-net-game-hack, which is presented as a lure for game hacks. The document body and embedded URLs reinforce this theme of offering free game-related cheats. The presence of these links and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful sites.

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.tw/app/835599320/tiktok-free-net-game-hack In PDF document text
    • https://library.institutpendidikan.ac.id/repository/free-robux-mod_GM431946152.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/roblox-free-candy-van-hack_GM431946152.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/the-new-roblox-hacker_GM431946152.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/how-to-get-admin-on-roblox-hack_GM431946152.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/roblox-hack-download-jailbreak-noclip_GM431946152.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/minecraft-for-free-apk_GM479516143.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/how-to-get-free-infinite-robux-in-roblox-imaflynmidget_GM431946152.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/free-roblox-accounts-with-obc-and-robux-2021_GM431946152.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/roblox-wall-hack-cheat-engine_GM431946152.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/howto-get-robux-for-free_GM431946152.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/coin-master-daily-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/free-robux-obby-meaning_GM431946152.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/cute-free-roblox-outfits_GM431946152.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/is-it-possible-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/roblox-pedo-van-hack_GM431946152.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/coin-master-free-link-today_GM406889139.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/2021-free-spins-coin-master-link_GM406889139.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/how-to-hack-coin-master-game-without-root_GM406889139.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/how-to-use-cheat-engine-pc-to-hack-roblox-games_GM431946152.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/how-to-get-free-robux-2021_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
font_00_sfnt_off00002fad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FAD 21668 bytes
SHA-256: 4d2d03a195154ace7f3a4ad91f094bb082cd404df763cfc7a5246e28888f88ed
font_01_sfnt_off00005f2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F2F 17972 bytes
SHA-256: 42605ac70523995b4cc1e7d989198621422d40db68992a6c53f7ea70b22e2539

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