Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba33fa429abdacab…

MALICIOUS

PDF

34.9 KB Created: 2021-07-04 12:24:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-23
MD5: a7fefbfe1b76a70b2190abb8978b978e SHA-1: 3cd08b50a8392e6917e648da01cc802149dc8c1f SHA-256: ba33fa429abdacabb0dccd38acf0dd925c166b2044ffea9b458c17ce3c408f12
160 Risk Score

Malware Insights

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

The PDF contains a lure for game hacks, directing users to a known malicious redirector. The ML classifier strongly indicates maliciousness. While no scripts were extracted, the presence of a malicious redirector and the lure suggest an attempt to download and execute a second-stage payload, likely exploiting a PDF vulnerability.

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/406889139/coin-master-event-hack-game-hack In PDF document text
    • http://lib.uho.ac.id/library/repository/minecraft-free-download-mac-full-version_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-games-roblox-games_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/public-enemy-sun-prairie-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/minecraft-alt-accounts-free_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/how-to-get-hacks-on-roblox_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/how-to-make-free-robux-games_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/how-to-get-free-robux-youtube_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/how-to-hack-minecraft_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-hack-iphone_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/hack-avatar_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/free-roblox-groups_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/how-to-get-free-tiktok-followers_GM835599320.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/make-your-own-minecraft-server-free_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-coin-master-cards_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-free-daily-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-ios-hack_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-coins-for-coin-master-blogger_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-robux-meme_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/minecraft-bedrock-download_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-robux-by-watching-videos-and-no-surveys-or-downloads_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_002_off0000325e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x325E 23188 bytes
SHA-256: 1bd3644efcda16285fcefc38de557ae8e2318ab34ba423d839da4caaf32d83b8
font_01_sfnt_off00006638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6638 18120 bytes
SHA-256: 69c206af1aa51094eb7cbb0a268499b96965dedda2f26d4b7c7da0ccbe57f98c

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