Malicious PDF — malware analysis report

Static analysis result for SHA-256 01634fd26ce9ff38…

MALICIOUS

PDF

44.4 KB Created: 2021-06-03 18:30:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: de9ddbb0f6b87d367eef7e52abd13569 SHA-1: 17a11c4306fc3c129f1db936bd5b8d4402cf65ec SHA-256: 01634fd26ce9ff38e8a66aff305db53c65d0898ffda45a6c37d3db4f32c7558f
142 Risk Score

Malware Insights

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

The PDF contains a lure for game hacks and free spins, directing users to external URLs. It also exhibits characteristics of a link farm, with numerous embedded links to other PDF files hosted on a similar domain. While no scripts were explicitly extracted, the PDF structure and embedded links suggest a malicious workflow aimed at redirecting users to potentially harmful content or facilitating further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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 https://netcdn.online/app/406889139/coin-master-free-spins-no-survey-game-hack PDF link annotation
    • http://lib.fisipumt.ac.id//repository/old-roblox-accounts-for-free_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/free-robux-redeem-codes_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/best-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/gamesofficenet-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/is-there-any-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/coin-master-gold-cards-free-link_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/coin-master-hack-with-facebook-login_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/how-to-make-a-private-server-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/coin-master-hack-ios-cydia_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/coin-master-cheat-codes_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/who-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/is-minecraft-free-on-mac_GM479516143.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/coin-master-free-cards-link_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/coin-master-hack-tool-v1-9-download-free_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/how-to-generate-free-coin-master-spin_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/how-to-hack-roblox-for-robux_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/coin-master-email-free-spins_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/what-is-exploiting-in-roblox_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/oprewards-com-earn_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/coin-master-mod-free-download_GM406889139.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
stream_004_off0000512b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x512B 24932 bytes
SHA-256: f9146670945b7db166b78ebc1d0e645eeeb767a745eab1abfe96935bad717905
font_01_sfnt_off00008a99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A99 18320 bytes
SHA-256: 8f8c071623a7703d27897fee0415069e7501bbca86f42ef797abe0a074016bd4

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