Malicious PDF — malware analysis report

Static analysis result for SHA-256 222a6689602fc3eb…

MALICIOUS

PDF

35.2 KB Created: 2021-07-05 18:03:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 1c7d6aaafa639cab9b59560838556e76 SHA-1: 0e9a28746b031f0d163e19f71a5acdb641dc90ca SHA-256: 222a6689602fc3eb81f82aedb99a4b728a668f8578b84329669d8ab1aefb8668
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links to a known malicious redirector, disguised as 'free game hacks' or 'free currency'. The primary lure is 'free robux without any verification' pointing to http://netcdn.tw/app/431946152/free-robux-without-any-verification-game-hack. The document's structure and embedded URLs strongly suggest a phishing or scam attempt designed to lead users to potentially malicious websites. No scripts were extracted, but the PDF's nature and embedded links are indicative of a social engineering attack.

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/431946152/free-robux-without-any-verification-game-hack In PDF document text
    • http://elibraryfk.unjani.ac.id/elibrary/repository/www-coin-master-hack-com_GM406889139.pdfIn PDF document text
    • http://elibraryfk.unjani.ac.id/elibrary/repository/best-free-roblox-executor_GM431946152.pdfIn PDF document text
    • http://elibraryfk.unjani.ac.id/fkrepository/repository/minecraft-java-code-free_GM479516143.pdfIn PDF document text
    • http://elibraryfk.unjani.ac.id/elibrary/repository/roblox-pirata-hack_GM431946152.pdfIn PDF document text
    • http://elibraryfk.unjani.ac.id/elibrary/repository/how-to-get-more-spins-on-coin-master-for-free_GM406889139.pdfIn PDF document text
    • http://elibraryfk.unjani.ac.id/elibrary/repository/roblox-vehicle-simulator-cheats-xbox-one_GM431946152.pdfIn PDF document text
    • http://elibraryfk.unjani.ac.id/elibrary/repository/coin-master-hack-ios_GM406889139.pdfIn PDF document text
    • http://elibraryfk.unjani.ac.id/fkrepository/repository/free-robux-bc-admin-leaked_GM431946152.pdfIn PDF document text
    • http://elibraryfk.unjani.ac.id/elibrary/repository/free-coins-coin-master-link-2021_GM406889139.pdfIn PDF document text
    • http://elibraryfk.unjani.ac.id/elibrary/repository/roblox-god-hack-cheat-engine-64_GM431946152.pdfIn PDF document text
    • http://elibraryfk.unjani.ac.id/elibrary/repository/how-to-hack-and-get-free-robux_GM431946152.pdfIn PDF document text
    • http://elibraryfk.unjani.ac.id/fkrepository/repository/free-spins-coin-master-daily_GM406889139.pdfIn PDF document text
    • http://elibraryfk.unjani.ac.id/fkrepository/repository/free-op-minecraft-servers_GM479516143.pdfIn PDF document text
    • http://elibraryfk.unjani.ac.id/elibrary/repository/minecraft-servers-that-allow-hacks_GM479516143.pdfIn PDF document text
    • http://elibraryfk.unjani.ac.id/elibrary/repository/how-to-get-robux-from-3-invites-free-nitro_GM431946152.pdfIn PDF document text
    • http://elibraryfk.unjani.ac.id/elibrary/repository/btools-hack-pastbin-roblox_GM431946152.pdfIn PDF document text
    • http://elibraryfk.unjani.ac.id/elibrary/repository/free-robux-code-giveaway-live_GM431946152.pdfIn PDF document text
    • http://elibraryfk.unjani.ac.id/elibrary/repository/free-minecraft-worlds_GM479516143.pdfIn PDF document text
    • http://elibraryfk.unjani.ac.id/fkrepository/repository/roblox-get-free-robux-crard-codes_GM431946152.pdfIn PDF document text
    • http://elibraryfk.unjani.ac.id/elibrary/repository/nitro-fun-cheat-codes-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
font_00_sfnt_off000031b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31B8 22152 bytes
SHA-256: 0cae87d10089193d0cdfd006b602bc2c42471a711eca3215d52b2a6b1fc60060
font_01_sfnt_off000062c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62C8 19620 bytes
SHA-256: 98e25ba6f0db8882549c0e371305563de57acb07d7fce2330b7496bf897a2717

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