Malicious PDF — malware analysis report

Static analysis result for SHA-256 461f69821a436482…

MALICIOUS

PDF

52.7 KB Created: 2021-06-07 04:08:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: a7e9c3f685f9306bd7fc934330aaa00c SHA-1: 0f360cdcde865c477726a566629da231a06dabd7 SHA-256: 461f69821a43648232369f964360ebd52c5f3c9e3f9b06dba982ad45e803d3b4
160 Risk Score

Malware Insights

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

The PDF contains multiple links to known malicious redirectors and other PDF files, masquerading as game hacks and generators. The ML classifier also flagged this PDF as malicious. The primary attack pattern involves luring users to click on these links, which likely leads to further malicious content or exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9614

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/free-roblox-creator-packs-game-hack In PDF document text
    • http://perpus.polimarim.online/repository/free-roblox-groups-with-funds_GM431946152.pdfIn PDF document text
    • http://perpus.polimarim.online/repository/roblox-hack-me_GM431946152.pdfIn PDF document text
    • http://perpus.polimarim.online/repository/roblox-hack-cheat-engine-62_GM431946152.pdfIn PDF document text
    • http://perpus.polimarim.online/repository/roblox-help-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.polimarim.online/repository/minecraft-hack-mod_GM479516143.pdfIn PDF document text
    • http://perpus.polimarim.online/repository/free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.polimarim.online/repository/coin-master-real-free-spins_GM406889139.pdfIn PDF document text
    • http://perpus.polimarim.online/repository/how-to-get-free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://perpus.polimarim.online/repository/minecraft-svg-free_GM479516143.pdfIn PDF document text
    • http://perpus.polimarim.online/repository/how-can-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.polimarim.online/repository/mcpe_GM479516143.pdfIn PDF document text
    • http://perpus.polimarim.online/repository/hack-xp-net-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.polimarim.online/repository/pubg-uc-uk_GM1330123889.pdfIn PDF document text
    • http://perpus.polimarim.online/repository/coin-master-village-3_GM406889139.pdfIn PDF document text
    • http://perpus.polimarim.online/repository/coinmasterfreespins_GM406889139.pdfIn PDF document text
    • http://perpus.polimarim.online/repository/free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://perpus.polimarim.online/repository/coin-master-game-hacks_GM406889139.pdfIn PDF document text
    • http://perpus.polimarim.online/repository/www-claim-gg-to-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.polimarim.online/repository/minecraft-free-apk_GM479516143.pdfIn PDF document text
    • http://perpus.polimarim.online/repository/free-robux-codes-generator_GM431946152.pdfIn 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_off0000544f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x544F 33120 bytes
SHA-256: 43cc04b6573ec3cf241add1d7cac9eb2cd184ea2e76d15598e11370c88251160
font_01_sfnt_off00009f41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9F41 3500 bytes
SHA-256: e49a868379cd3c37e631c5a53c010e21f38d803532a2b8417aee82315d4e8634
font_02_sfnt_off0000aae2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAAE2 18604 bytes
SHA-256: 3b7beab6bdcc666dbdaa4f06ea0c29ca2881e1be65d5d6c2ef11a1a2289599f8

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