Malicious PDF — malware analysis report

Static analysis result for SHA-256 91de0385fa3b6d09…

MALICIOUS

PDF

41.6 KB Created: 2021-05-12 01:35:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 4bff987708d547298b92fe29e80acc31 SHA-1: dee7bab5f907e18eac879ebf03caf14737749461 SHA-256: 91de0385fa3b6d0942268e447d344ba5883d53a12df243903c39ff734e078f65
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links that redirect to malicious infrastructure, specifically promoting 'free generators' for games like Coin Master. The document body and embedded link objects confirm this lure. While no scripts were explicitly extracted, the PDF structure itself facilitates the redirection, likely leading to a phishing or malware download site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.xyz/app/406889139/hacks-and-cheats-for-coin-master-game-hack In PDF document text
    • https://mbbs.hr/files/free-coin-and-spin-in-coin-master_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/minecraft-java-edition-free-code_GM479516143.pdfIn PDF document text
    • https://mbbs.hr/files/get-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/coin-master-apk_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/coin-master-website_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/free-spins-coin-master-generator_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/freespinandcoin-blogspot-coin-master_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/coin-master-game-for-pc-free-download_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/coin-master-free-spins-cash_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/500-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/how-to-get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/wurst-client-112-2_GM479516143.pdfIn PDF document text
    • http://mbbs.hr/files/spin-rewards-coin-master_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/coin-master-pc-hack_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/how-do-i-get-free-robux_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/minecraft-pe-016-0-apk-download-free_GM479516143.pdfIn PDF document text
    • http://mbbs.hr/files/free-spin-and-daily-news-coin-master_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/op-rewards-robux_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/how-to-hack-any-roblox-account_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/how-do-i-get-free-spins-on-coin-master_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_003_off000048c1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x48C1 24352 bytes
SHA-256: 00010dc554493321bc412178402c2998a20c6d6fd5cce486da2ba531914b5abf
font_01_sfnt_off0000807b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x807B 18220 bytes
SHA-256: a46c006b512b84888bc8fbab681985973724221ae7a22be5c9063266660da03e

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