Malicious PDF — malware analysis report

Static analysis result for SHA-256 f460bc6990d1aa8b…

MALICIOUS

PDF

43.6 KB Created: 2021-06-03 20:44:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: bd6fb6c2f308fe592abc68382452a824 SHA-1: dd81d06709e701649805b5c8a9873e95352c5550 SHA-256: f460bc6990d1aa8bde4680e38bad99928f19b5599ad93e70ddcbf01e98e469a2
160 Risk Score

Malware Insights

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

The PDF contains multiple links to known malicious redirectors and infrastructure, disguised as game hacks and generators. The primary lure is to trick users into clicking a link that ultimately leads to malicious content, likely for financial gain or further compromise. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest a malicious redirection workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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/406889139/collect-free-spins-coin-master-game-hack In PDF document text
    • https://kojak-group.com/userfiles/files/free-robux-generator-2021-no-survey_GM431946152.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/free-tiktok-followers-no-downloads_GM835599320.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/roblox-free-robux-website_GM431946152.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/hack-coin-master-pc_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/minecraft-java-edition-free-trial_GM479516143.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/how-to-get-free-robux-promo-codes_GM431946152.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/free-minecraft-capes_GM479516143.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/easy-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/coin-master-hack-online-download_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/coin-master-hack-to-get-free-spins_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/rewards-robux_GM431946152.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/pubg-uc-id_GM1330123889.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/roblox-arsenal-hack-script-pastebin_GM431946152.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/free-roblox-outfits-2021_GM431946152.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/coin-master-cards-hack_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/daily-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/rewards-roblox_GM431946152.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/moonactive-free-spins-link_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/coin-master-hack-spin-generator_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/robux-online_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004fe1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4FE1 24928 bytes
SHA-256: f2da14b8985a487c78073ccf99335fbf47d31553d22787a8a128ff8d6eb1dd90
font_01_sfnt_off000088f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x88F3 17960 bytes
SHA-256: 56908844ab102c912342fec259dbf5a97100868d5d877c05497f82053eb67f28

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