Malicious PDF — malware analysis report

Static analysis result for SHA-256 af673f0677aa6e67…

MALICIOUS

PDF

47.6 KB Created: 2021-06-03 21:20:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 232136b3b549d1b3f1204e62a399639b SHA-1: 97902a7d7f95ae7809f86ce468e7b8e9b95b6a04 SHA-256: af673f0677aa6e6725948c3843069de7848ba8b7bc88b01833a05995be57204f
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links designed to lure users into clicking on them for 'free game hacks' or currency. These links redirect to malicious infrastructure, indicating a phishing or scam attempt. The presence of embedded URLs and the ML classifier's high confidence score support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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/how-to-get-free-robux-easy-on-phone-game-hack In PDF document text
    • https://kojak-group.com/userfiles/files/claimrbx-free-robux_GM431946152.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/coin-master-free-spins-ios_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/free-spins-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/coin-master-free-spins-link-today-facebook_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/coin-master-free-spin-and-coins-links_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/how-to-get-free-robux-without-verifying-2021_GM431946152.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/coin-master-free-spins-bit-ly_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/how-to-hack-roblox-accounts-for-robux_GM431946152.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/coin-master-free-gifts_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/minecraft-hack-2021_GM479516143.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/free-roblox-accounts-with-robux-2021_GM431946152.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/free-robux-working_GM431946152.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/roblox-free-online-game_GM431946152.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/free-robux-promo-codes_GM431946152.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/hack-download_GM431946152.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/oprewards-com-roblox_GM431946152.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/extra-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/roblox-free-robux-com_GM431946152.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/minecraft-servers-that-allow-hacks_GM479516143.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/free-robux-no-human-verification_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_004_off00005372.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5372 28216 bytes
SHA-256: d02096c1e2d3bafd9dfb823b43ac86019335805a11cc6045228387f5165fef6e
font_01_sfnt_off0000957c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x957C 19008 bytes
SHA-256: e6e3347b6ae704c87521381cf50d1046861d1e5efe3155f159bfcc6a29e599dd

Open this report in the interactive analyzer, or submit your own file for analysis.