Malicious PDF — malware analysis report

Static analysis result for SHA-256 90c611a4577787bd…

MALICIOUS

PDF

34.0 KB Created: 2021-06-22 18:04:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 8e76ff9389c247acdb5dff48c2c433c3 SHA-1: 3da51e919d528e9fe2abb4872d8e31257df59209 SHA-256: 90c611a4577787bd88b1ee4e4c7f86c0c7b939db63dbf64f8f89ed55bfe18a42
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to a known malicious redirector infrastructure, specifically advertising free Robux and game hacks. The embedded URLs and document body content strongly suggest a lure to trick users into visiting malicious sites. While no scripts were explicitly extracted, the nature of PDF redirection often involves JavaScript to facilitate the download or further redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.co/app/431946152/20210-robux-game-hack In PDF document text
    • https://www.hearcolors.com.mx/img/blog/files/hack-game-coin-master_GM406889139.pdfIn PDF document text
    • https://www.hearcolors.com.mx/img/blog/files/roblox-robux_GM431946152.pdfIn PDF document text
    • https://www.hearcolors.com.mx/img/blog/files/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://www.hearcolors.com.mx/img/blog/files/minecraft-free-education_GM479516143.pdfIn PDF document text
    • https://www.hearcolors.com.mx/img/blog/files/how-to-get-free-face-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.hearcolors.com.mx/img/blog/files/wurst-download_GM479516143.pdfIn PDF document text
    • https://www.hearcolors.com.mx/img/blog/files/free-robux-no-survey-2021_GM431946152.pdfIn PDF document text
    • https://www.hearcolors.com.mx/img/blog/files/free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.hearcolors.com.mx/img/blog/files/coin-master-unlimited-spin-link_GM406889139.pdfIn PDF document text
    • https://www.hearcolors.com.mx/img/blog/files/minecraft-pe-apk-download_GM479516143.pdfIn PDF document text
    • https://www.hearcolors.com.mx/img/blog/files/dominus-roblox-free_GM431946152.pdfIn PDF document text
    • https://www.hearcolors.com.mx/img/blog/files/free-coin-coin-master_GM406889139.pdfIn PDF document text
    • https://www.hearcolors.com.mx/img/blog/files/my-roblox-avatar_GM431946152.pdfIn PDF document text
    • https://www.hearcolors.com.mx/img/blog/files/how-to-get-minecraft-bedrock-for-free_GM479516143.pdfIn PDF document text
    • https://www.hearcolors.com.mx/img/blog/files/free-coin-master-cards_GM406889139.pdfIn PDF document text
    • https://www.hearcolors.com.mx/img/blog/files/robux-today_GM431946152.pdfIn PDF document text
    • https://www.hearcolors.com.mx/img/blog/files/minecraft-hacks-18-9_GM479516143.pdfIn PDF document text
    • https://www.hearcolors.com.mx/img/blog/files/hack-coin-master-apk-358_GM406889139.pdfIn PDF document text
    • https://www.hearcolors.com.mx/img/blog/files/free-robux-no-verification-at-all_GM431946152.pdfIn PDF document text
    • https://www.hearcolors.com.mx/img/blog/files/free-gold-cards-coin-master_GM406889139.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
font_00_sfnt_off00002d7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D7D 22592 bytes
SHA-256: 33f1ed3c1a6e04b9ce5373dc6eb755b57b229d7a7f42d5f50859ed445cf9f477
font_01_sfnt_off00005ff9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FF9 18956 bytes
SHA-256: 75ea27529c0c01066f51b2c4a610dacd0c00866775fa9ae9f69139e6484c1ffd

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