Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4f1213a46c3b38d…

MALICIOUS

PDF

59.0 KB Created: 2021-06-04 02:25:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 728edf1fef014ffbf99425770ebf44f2 SHA-1: 0a2e1083cfc0bb10047c54cbe2d2fd867a443465 SHA-256: a4f1213a46c3b38d99a2aec3494e7eb775700b53973fbc702b5be0f15542bc3a
160 Risk Score

Malware Insights

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

The PDF document contains a lure for a 'free Robux generator' which redirects to a known malicious URL. The ML classifier also flagged this PDF as malicious. The presence of embedded URLs and the nature of the lure suggest an attempt to redirect users to a site that likely hosts further malicious content or exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9611

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.online/app/431946152/free-robux-generator-no-human-verification-or-surveys-game-hack In PDF document text
    • http://opac.library.uib.ac.id//repository/pubg-uc-avatar-hd_GM1330123889.pdfIn PDF document text
    • http://opac.library.uib.ac.id//repository/free-robux-on-iphone_GM431946152.pdfIn PDF document text
    • http://opac.library.uib.ac.id//repository/how-to-get-free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://opac.library.uib.ac.id/repository/free-robux-pastebin_GM431946152.pdfIn PDF document text
    • http://opac.library.uib.ac.id/repository/free-minecraft-skins_GM479516143.pdfIn PDF document text
    • http://opac.library.uib.ac.id/repository/earn-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://opac.library.uib.ac.id//repository/minecraft-xbox-free_GM479516143.pdfIn PDF document text
    • http://opac.library.uib.ac.id/repository/robux-apk_GM431946152.pdfIn PDF document text
    • http://opac.library.uib.ac.id/repository/minecraft-pe-hacks-2021_GM479516143.pdfIn PDF document text
    • http://opac.library.uib.ac.id//repository/free-spins-coin-master-links-blogger_GM406889139.pdfIn PDF document text
    • http://opac.library.uib.ac.id//repository/free-robux-no-verify_GM431946152.pdfIn PDF document text
    • http://opac.library.uib.ac.id/repository/how-to-use-redstone_GM479516143.pdfIn PDF document text
    • http://opac.library.uib.ac.id//repository/coin-master-hack-apk-no-survey_GM406889139.pdfIn PDF document text
    • http://opac.library.uib.ac.id/repository/how-to-hack-roblox-2021_GM431946152.pdfIn PDF document text
    • http://opac.library.uib.ac.id//repository/free-roblox-accounts-with-robux_GM431946152.pdfIn PDF document text
    • http://opac.library.uib.ac.id//repository/roblox-free-draw_GM431946152.pdfIn PDF document text
    • http://opac.library.uib.ac.id/repository/coin-master-hack-apk-2021-ios_GM406889139.pdfIn PDF document text
    • http://opac.library.uib.ac.id/repository/coin-master-apk-hack-2021-ios_GM406889139.pdfIn PDF document text
    • http://opac.library.uib.ac.id/repository/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://opac.library.uib.ac.id/repository/free-roblox-hair-to-wear_GM431946152.pdfIn PDF document text
    • http://wolfzscriptsIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000534b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x534B 39672 bytes
SHA-256: a92e0544245103f5fabf97dabea0d4d014aecdd443989e66a43fc7a3c781a1ec
font_01_sfnt_off0000aa17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAA17 3064 bytes
SHA-256: 6fa41d3bf802a2ef91ccaabb6af4e2003f80495f9918b63548407be786435262
font_02_sfnt_off0000b4c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4C3 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_03_sfnt_off0000c1d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1D4 19156 bytes
SHA-256: b23a4dbd5b2cf0eeb4dbb5626642de4de2979fce29ecd3df28c5d1ef95471ce4

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