Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1c18077091c7e8a…

MALICIOUS

PDF

33.7 KB Created: 2021-07-04 13:13:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 672be2362bba3b3ec7aca9e0fbc54bfb SHA-1: 27c5d7b4dfa20a8ed59a51fda0aa49aaf17c1ce7 SHA-256: a1c18077091c7e8ae16203fc4c4c961898f2272194408ff466090cd1bfb3da65
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/406889139/coin-master-hack-ios-apk-game-hack PDF link annotation
    • http://pustaka.bbppketindan.info/repository/roblox-launcher-hack_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/roblox-hack-how-to-see-peoples-inventory_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/free-robux-no-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/how-to-hack-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/free-robux-websites-that-work_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/free-robux-that-actually-works-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/how-o-ge-free-robux-regular_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/free-robux-com-no-verification_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/coin-master-free-spins-and-free-coins_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/free-roblox-promo-codes-december-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/dolphin-hacks-roblox-exploits_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/coin-master-hack-apk-2021-download_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/coin-master-rewards_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/best-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/free-builders-club-roblox-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/roblox-com-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/how-to-get-minecraft-pocket-edition-for-free_GM479516143.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/coin-master-free-spins-link-blogspot_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/how-to-get-800-robux-for-free_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/roblox-hack-one-piece-millennium_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
stream_002_off00002f38.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2F38 22508 bytes
SHA-256: 156c91bdc1f2b638a7d2237115826cf7a6a1cff5d712f949e4b5b16ebb2d5e64
font_01_sfnt_off00006156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6156 18180 bytes
SHA-256: 4c5127a69f018205538da135c479e78cbc581b43c71a88b63707f7d03620f798

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