Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c6d589c988e1885…

MALICIOUS

PDF

45.0 KB Created: 2021-05-14 09:47:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: acfcdeaf4b56a7fed9080bb3a3b1a711 SHA-1: 0a3ab76e8725282e4d987ba0901567946b22ac03 SHA-256: 0c6d589c988e1885f0bbe2b28bfcd6e4abcb00fb2d5d20181e9c45bf4aba4848
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, specifically advertising 'free generators' and 'game hacks' for popular online games. The document body also contains a prominent call-to-action link to 'Robux Com Free Robux' which resolves to a malicious URL. These elements strongly suggest a phishing or scam campaign aimed at tricking users into visiting malicious sites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9632

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/431946152/robux-com-free-robux-game-hack In PDF document text
    • http://ptts.pl/images/_GM479516143.pdfIn PDF document text
    • http://ptts.pl/images/is-java-minecraft-free_GM479516143.pdfIn PDF document text
    • http://ptts.pl/images/hack-minecraft_GM479516143.pdfIn PDF document text
    • http://ptts.pl/images/robux-generators-that-actually-work_GM431946152.pdfIn PDF document text
    • http://ptts.pl/images/coin-master-freebies-2021_GM406889139.pdfIn PDF document text
    • http://ptts.pl/images/free-minecraft-com_GM479516143.pdfIn PDF document text
    • http://ptts.pl/images/rbxdemon_GM431946152.pdfIn PDF document text
    • http://ptts.pl/images/gain-robux_GM431946152.pdfIn PDF document text
    • http://ptts.pl/images/free-robux-youtube_GM431946152.pdfIn PDF document text
    • http://ptts.pl/images/hack-coin-master-free_GM406889139.pdfIn PDF document text
    • http://ptts.pl/images/cm-daily-spins_GM406889139.pdfIn PDF document text
    • http://ptts.pl/images/coin-master-apk-hack-3527_GM406889139.pdfIn PDF document text
    • http://ptts.pl/images/free-headless-head-roblox_GM431946152.pdfIn PDF document text
    • http://ptts.pl/images/coin-master-game-free-spin-download_GM406889139.pdfIn PDF document text
    • http://ptts.pl/images/get-robux_GM431946152.pdfIn PDF document text
    • http://ptts.pl/images/roblox-gang_GM431946152.pdfIn PDF document text
    • http://ptts.pl/images/coin-master-spin-hack-no-human-verification_GM406889139.pdfIn PDF document text
    • http://ptts.pl/images/coin-master-free-spins-hack-2021_GM406889139.pdfIn PDF document text
    • http://ptts.pl/images/free-spins-for-coin-master-app_GM406889139.pdfIn PDF document text
    • http://ptts.pl/images/how-to-get-roblox-money_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_off00004516.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4516 27120 bytes
SHA-256: 2704c321c9442b11922dc0c6b6dd25d2d21748fcfae2e1af02c7a3c4031cff30
font_01_sfnt_off000083dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83DC 2820 bytes
SHA-256: d88f25cfe237a714f996150a11dd8a058f0f7c3e9d1ae91c17b46c10409b6c0b
font_02_sfnt_off00008d76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D76 18276 bytes
SHA-256: 15a0db03ecad41b32ad15729058012b5ee1d917146ec7af3e780186d41394abc

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