Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dba1dd2ff1a9b9f…

MALICIOUS

PDF

52.9 KB Created: 2021-06-09 04:50:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 5aca40ef78ee6cf5098469f7053e2cdc SHA-1: 77263bda6a4cd54eabc9c76eb1b90223c16c4f56 SHA-256: 8dba1dd2ff1a9b9f85e682b89cc4887eb5432a7f3657d6583902a760ee72116f
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a common lure of free game generators and hacks to entice users. It contains multiple links to known malicious redirector infrastructure, specifically pointing to 'netcdn.tw'. The document body and embedded links suggest a phishing attempt disguised as a guide for obtaining in-game currency or cheats. No scripts were extracted, but the primary malicious function appears to be directing users to potentially harmful external sites.

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/how-to-get-free-robux-2021-no-generator-game-hack In PDF document text
    • http://lib.stimykpn.ac.id/repository/code-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-private-server-roblox_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/roblox-console-inspect-command-hack_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/link-for-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/best-free-roblox-outfits_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/cheat-engine-for-roblox-apocalypse-rising_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/get-free-coin-master-coins_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-roblox-colouring-pictures_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/coin-master-free-spins-coins_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/roblox-free-robux-com_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/rbx-claim_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/can-you-get-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/coin-master-hacks-for-cards_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/free-coin-master-spins-daily_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/coin-master-hack-xyz_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/coin-master-free-spins-and-coins-hack_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/tiktok-free-pictures_GM835599320.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/coin-master-hack-that-actually-works_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/coin-master-hack-2021-link_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/robuxmatch-com-free-robux_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_off0000529a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x529A 32600 bytes
SHA-256: 808306681c44fd1af36666cda8a6560a29b77799fd6635027859a8872c034ea4
font_01_sfnt_off00009dc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9DC4 3884 bytes
SHA-256: 40b61f8938bd710dc29dc58ba3fde91c245a6a69596ec569b4d27c769ca417cf
font_02_sfnt_off0000aa6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAA6B 18912 bytes
SHA-256: f65b6e4df2f4004b18e3ac01e17f70ee7d77de2d268157471f5bc9d094a0d96e

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