Malicious PDF — malware analysis report

Static analysis result for SHA-256 f356d8f960c39156…

MALICIOUS

PDF

33.3 KB Created: 2021-07-03 14:27:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 98c2bb4889a27aa2bef486f0fdb788f1 SHA-1: 5f1d01b407ccb4be0a91752e2bab81f9b12a23fb SHA-256: f356d8f960c3915605c43fb4e4e51860de04e75b7f861e86785140078ad65154
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous links to external websites, many of which are designed to lure users into downloading further content or visiting malicious redirectors. The primary redirector URL is http://netcdn.tw/app/479516143/tiktok-minecraft-hacks-game-hack, which is associated with a 'free generator / game hack' lure. The document body and heuristics indicate a phishing or scam attempt leveraging popular game and platform names to entice clicks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/479516143/tiktok-minecraft-hacks-game-hack In PDF document text
    • http://lib.kunci.or.id/repository/how-to-get-free-robux-without-any-verification_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/free-robux-and-limiteds-roblox_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/earn-robux-for-roblox_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/roblox-cruise-ship-tycoon-cheats_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/free-robux-codes-no-verification_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/roblox-realty-free-music-one_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/free-spins-coin-master-android_GM406889139.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/coin-master-free-spins-hack_GM406889139.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/free-spins-and-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/free-tiktok-likes_GM835599320.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/free-roblox-glasses_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/how-to-get-free-robux-easy_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/how-to-hack-coin-master-spin-ios_GM406889139.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/free-robux-without-human-verification-real_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/how-to-get-free-hair-extensions-on-roblox_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/free-robux-cards-no-verification_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/free-skin-strucid-roblox_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/free-robux-without-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/emotes-roblox-free_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/free-robux-codes-january-2021_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_off000030cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30CF 21624 bytes
SHA-256: 23b79748ae0115b2f3f28b4ee42a2059af90a1b8c8a6e0fb54542a4486b5c2d7
font_01_sfnt_off00005ffc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FFC 18168 bytes
SHA-256: 49b148a5ca756e3f3293ae7356a748e2214796aae6d20bfd78280b7e22c0c315

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