Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fb3894194f88c68…

MALICIOUS

PDF

45.2 KB Created: 2021-06-08 22:25:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: a023c68078f73a932dc03a61f4be71ff SHA-1: df95b7212eb0c1025c674fdbae2d5c88f46eaffe SHA-256: 9fb3894194f88c6879021986cd9b8ab3d2482ac0c4382afee45db3f33d0ca1ce
160 Risk Score

Malware Insights

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

The PDF contains a link that redirects to malicious infrastructure, disguised as a game hack generator. This lure is intended to trick users into clicking the link, likely leading to further malicious activity or malware download. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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/hacks-para-cb-ro-roblox-game-hack In PDF document text
    • https://www.nara.org.uk/uploads/files/files/mcpe-master-hack-unlimited-coins-latest-version_GM406889139.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/get-free-spins-link-in-coin-master_GM406889139.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/free-robux-with-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/coin-master-unlimited-spin-link_GM406889139.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/freerobuxhack-us-2021_GM431946152.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/coin-master-daily-free-cards_GM406889139.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/free-stuff-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/how-to-get-a-free-minecraft-account_GM479516143.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/freerobux-hack-us_GM431946152.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/how-to-get-free-roebucks_GM431946152.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/get-roebucks-com_GM431946152.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/free-robux-generator-2021-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/free-robux-today_GM431946152.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/best-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/windows-10-minecraft-hacks_GM479516143.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/free-robux-rewards_GM431946152.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/free-robux-reddit_GM431946152.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/minecraft-free-download-android-apk_GM479516143.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/coin-master-free-coins-2021_GM406889139.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/free-robux-no-verification-2021-ios_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
font_00_sfnt_off00005109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5109 26532 bytes
SHA-256: 053edc03d4c9ddbe6e0fc92393449fbcd7cadab6f0d12c9dd5b4a7f96d1a2f97
font_01_sfnt_off00008df1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8DF1 18336 bytes
SHA-256: 4c4f9cb16967ebcd92d0b6afafe4d66a369f0306125739430559ebdbfb9589b4

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