Malicious PDF — malware analysis report

Static analysis result for SHA-256 b445bb45db4a8638…

MALICIOUS

PDF

46.8 KB Created: 2021-06-13 23:51:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 49c46351dfc9ac13bfbd77417c679cdc SHA-1: 8c5705431e2249897d434b0867247df71f5c59f4 SHA-256: b445bb45db4a863825be81ba7b8110aef6fe63670ba402b0915647d870653d5f
228 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are part of a link farm designed to attract users searching for game cheats and currency generators. One prominent URL, http://netcdn.co/app/431946152/roblox-lua-script-hacks-gui-game-hack, is identified as a malicious redirector. The document's structure and content strongly suggest a phishing or scam attempt, likely to lead users to malware downloads or further phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8948

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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.co/app/431946152/roblox-lua-script-hacks-gui-game-hack In PDF document text
    • http://library.umla.ac.id/repository/daily-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/robux-gift-card-codes-for-free_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/android-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/how-to-get-unlimited-robux_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/coin-master-link-spin_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/lucky-patcher-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/free-cash-roblox-pizza-place_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/coin-master-free-foxy-food_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/free-roblox-card-codes-no-verification_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/coin-master-free-spins-link-today-hack_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/free-robux-real_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/master-free-spin-and-coin-link_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/how-to-hack-minecraft_GM479516143.pdfIn PDF document text
    • http://library.umla.ac.id/repository/pig-master-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/coin-master-free-spins-link-2021-april_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/how-to-make-a-free-server-in-minecraft-java_GM479516143.pdfIn PDF document text
    • http://library.umla.ac.id//repository/minecraft-hack-download_GM479516143.pdfIn PDF document text
    • http://library.umla.ac.id/repository/can-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/coin-master-free-spins-only_GM406889139.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_003_off000049e8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49E8 25972 bytes
SHA-256: 7b0d28e9a6247fcb21ccf25ebe7ad4650ad410f793ea31bc5671061001d7f4ee
font_01_sfnt_off000085ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x85EF 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off00009301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9301 18724 bytes
SHA-256: 05a037ff09b1e1533ab1a64ef45cca1154e6641b74ed2f3d861f6fd165a4be44

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