Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb9211205948c36b…

MALICIOUS

PDF

46.6 KB Created: 2021-06-08 09:55:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 8b94133566773c0c1daa5a9c727df1b0 SHA-1: 1acea996eef38d1d83a8c2ed5ff03e3b13740fbf SHA-256: cb9211205948c36bf6d3580c4c0fa65ef1234c6189bdcc363dd88d8749fb3914
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure related to free game currency and links to known malicious redirector infrastructure. The embedded URL, https://netcdn.tw/app/431946152/free-roblox-gift-card-codes-2021-september-game-hack, is identified as a malicious redirector. The document body also contains numerous links to other PDF files hosted on ebook.itn.ac.id, which are likely part of the same lure campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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-gift-card-codes-2021-september-game-hack In PDF document text
    • http://ebook.itn.ac.id/repository/free-spins-coin-master-blogspot_GM406889139.pdfIn PDF document text
    • http://ebook.itn.ac.id/repository/minecraft-games-to-play-for-free_GM479516143.pdfIn PDF document text
    • http://ebook.itn.ac.id/repository/stock-speed-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://ebook.itn.ac.id/repository/huskybuscom-free-robux_GM431946152.pdfIn PDF document text
    • http://ebook.itn.ac.id/repository/roblox-hack-unlimited-robux_GM431946152.pdfIn PDF document text
    • http://ebook.itn.ac.id/repository/minecraft-realms-free-trial_GM479516143.pdfIn PDF document text
    • http://ebook.itn.ac.id/repository/roblox-help-free-robux_GM431946152.pdfIn PDF document text
    • http://ebook.itn.ac.id/repository/coin-master-400-spin-link_GM406889139.pdfIn PDF document text
    • http://ebook.itn.ac.id/repository/how-do-i-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://ebook.itn.ac.id/repository/how-to-get-free-robux-on-pc_GM431946152.pdfIn PDF document text
    • http://ebook.itn.ac.id/repository/free-robux-generator-without-human-verification_GM431946152.pdfIn PDF document text
    • http://ebook.itn.ac.id/repository/how-to-get-roblox-money_GM431946152.pdfIn PDF document text
    • http://ebook.itn.ac.id/repository/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://ebook.itn.ac.id/repository/free-robux-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://ebook.itn.ac.id/repository/roblox-april-fools-hack_GM431946152.pdfIn PDF document text
    • http://ebook.itn.ac.id/repository/coin-master-free-spins-link-fb_GM406889139.pdfIn PDF document text
    • http://ebook.itn.ac.id/repository/coin-master-heaven-free-spins_GM406889139.pdfIn PDF document text
    • http://ebook.itn.ac.id/repository/minecraft-java-edition-redeem-code-free-2021_GM479516143.pdfIn PDF document text
    • http://ebook.itn.ac.id/repository/coin-master-hack-online-without-human-verification_GM406889139.pdfIn PDF document text
    • http://ebook.itn.ac.id/repository/i-got-hacked-on-roblox_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_004_off00005201.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5201 28120 bytes
SHA-256: 6c12220cfa062f245ae25ba0fc1972eb28f1704eef71bf4318a3c76c61a9f00d
font_01_sfnt_off0000903b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x903B 19412 bytes
SHA-256: 87caf109c5476de46e6a9fe97e23fac304d33a1632de3039c5c83c6d61ab6073

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