Malicious PDF — malware analysis report

Static analysis result for SHA-256 44c8f49f9026734c…

MALICIOUS

PDF

34.4 KB Created: 2021-07-03 22:02:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 914d1af86b9963369310c47c915ea40d SHA-1: 238512f693a470d35430749cf271a87e822def2d SHA-256: 44c8f49f9026734cb613726d8a6ff21ef01f1389cd6fbdca5aaa5690989d42ae
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/minecraft-nintendo-switch-digital-code-free-game-hack PDF link annotation
    • http://library.forda-mof.org/katalog/repository/how-to-hack-people-on-roblox_GM431946152.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/lucky-patcher-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/coin-master-hack-ios-download_GM406889139.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/how-to-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/coin-master-mod-version-free-download-ios_GM406889139.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/coin-master-villages_GM406889139.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/how-to-get-free-robux-app_GM431946152.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/coin-master-free-daily-spins-link_GM406889139.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/how-to-get-minecraft-for-free-on-nintendo-switch_GM479516143.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/free-spin-coin-master-iphone_GM406889139.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/roblox-army-free-robux_GM431946152.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/how-to-get-free-robux-august-2021_GM431946152.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/comment-avoir-des-robux-sans-hack_GM431946152.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/robux-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/coin-master-game-free_GM406889139.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/coin-master-34-4-free-download_GM406889139.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/free-roblox-scripts_GM431946152.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/free-robux-generator_GM431946152.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/roblox-executor-free-download_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_off000032a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x32A1 21764 bytes
SHA-256: 3e34d4937f2dd4eb36ece072cd81f02d33d6fdce253cafa9c58d0adf4c93bf08
font_01_sfnt_off000062a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62A5 18744 bytes
SHA-256: 39428c206c609bf194df99e48b3a05aaca79100e1a0a860ab3e065a57b3738de

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