Malicious PDF — malware analysis report

Static analysis result for SHA-256 11591ca369236c11…

MALICIOUS

PDF

47.2 KB Created: 2021-05-12 19:09:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 74131d0e19b151b201ac3b73d261c108 SHA-1: e93b5439a68f108e2360cfda10fe3b83618e4676 SHA-256: 11591ca369236c110a77b9ce15cad4ee071a6cfa60d46651673d4d6e17b44ba2
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, specifically promoting 'free generators' and 'hacks' for popular games. The document body and embedded URLs strongly suggest a phishing or scam attempt designed to lure users to malicious infrastructure. No scripts were extracted, but the PDF's structure and embedded links are indicative of a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8948

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/free-coin-and-spin-in-coin-master-game-hack In PDF document text
    • https://kimolos-link.gr/images/easy-robux-hack_GM431946152.pdfIn PDF document text
    • https://kimolos-link.gr/images/how-to-get-free-spins-on-coin-master-ios_GM406889139.pdfIn PDF document text
    • https://kimolos-link.gr/images/minecraft-games-online-free-no-download_GM479516143.pdfIn PDF document text
    • https://kimolos-link.gr/images/coin-game_GM406889139.pdfIn PDF document text
    • https://kimolos-link.gr/images/coin-master-links-2021_GM406889139.pdfIn PDF document text
    • https://kimolos-link.gr/images/how-to-get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • https://kimolos-link.gr/images/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • https://kimolos-link.gr/images/coin-master-free-box_GM406889139.pdfIn PDF document text
    • https://kimolos-link.gr/images/free-spins-and-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://kimolos-link.gr/images/how-to-hack-coin-master-spin-in-hindi_GM406889139.pdfIn PDF document text
    • https://kimolos-link.gr/images/free-robux-games_GM431946152.pdfIn PDF document text
    • https://kimolos-link.gr/images/minecraft-online-free-no-download_GM479516143.pdfIn PDF document text
    • https://kimolos-link.gr/images/coin-master-hack-spin-link_GM406889139.pdfIn PDF document text
    • https://kimolos-link.gr/images/free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://kimolos-link.gr/images/free-star-codes-roblox_GM431946152.pdfIn PDF document text
    • https://kimolos-link.gr/images/infinite-robux_GM431946152.pdfIn PDF document text
    • https://kimolos-link.gr/images/coin-master-free-spins-apk-2021_GM406889139.pdfIn PDF document text
    • https://kimolos-link.gr/images/wurst-hacked-client-112-2_GM479516143.pdfIn PDF document text
    • https://kimolos-link.gr/images/free-robux-redeem-codes-2021_GM431946152.pdfIn PDF document text
    • https://kimolos-link.gr/images/rblx-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004781.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4781 32592 bytes
SHA-256: daf8e42a83934e29c7848d8f97d02e7ee264a4532c21f4f302b69b5000b2c6a6
font_01_sfnt_off00008d0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D0A 2812 bytes
SHA-256: fc92a80cefddbcc51cb4ecd7284aa73b746cbd66adcf1d96110f0323ec06b51f
font_02_sfnt_off000096ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x96AB 18060 bytes
SHA-256: e7e0a884e59d6d4457fb90cba238d6b772cb21bcfadc79e96e95c97f919ce424

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