Malicious PDF — malware analysis report

Static analysis result for SHA-256 0aa1c8cb168c176b…

MALICIOUS

PDF

35.1 KB Created: 2021-07-04 02:32:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 4d7cfee6ccf11556eb99ccfb9aebd45a SHA-1: 1c9aea46644c447df1c8ee96b3055de1b7134794 SHA-256: 0aa1c8cb168c176bb988d6604f4cfc454a4748f973a022c0f32895e0b1ee7a94
160 Risk Score

Malware Insights

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

The PDF contains multiple links to a known malicious redirector, masquerading as a 'game hack generator'. The document body and embedded URLs reinforce this lure, aiming to trick users into visiting the malicious site. The ML classifier also strongly indicated maliciousness.

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/how-to-hack-coin-master-root-game-hack In PDF document text
    • http://lib.uho.ac.id/library/repository/roblox-free-noob-accounts_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/minecraft-pe-free-download-android_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/toolbox-apk_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-spins-coin-master-site-wwwquoracom_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/coin-master-free-spin-link-app_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/free-limiteds-roblox_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/daily-spin-and-coin_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-coin-master-cheats_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/coin-master-hack-progamers_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/minecraft-pe-apk-free-download_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/how-to-get-free-roebucks_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/code-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-gift-in-big-paintball-roblox_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/minecraft-book-collection_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/moon-static-coin-master-generator-hacks-free_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/legit-coin-master-hack-october-2021_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/can-you-actually-get-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/admin-commands-roblox-hack_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-roblox-templates_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/funny-tshirts-for-free-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_002_off000032a9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x32A9 23216 bytes
SHA-256: 8faaef1f45c843ac71f7acfa72420af76eac048653192a1590dbbc4396283fc3
font_01_sfnt_off000066f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66F2 18168 bytes
SHA-256: b084d0e2e86f47cdd64d82d1d6e6bdcefc655448caf01d999206dcd8136a3bd2

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