Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a9ed1cb19310298…

MALICIOUS

PDF

35.7 KB Created: 2021-06-28 10:36:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 4297a25c151d2a79198f6f2da2ecf849 SHA-1: becd04c42b2a61f564327ff425999a9b9bcca7e7 SHA-256: 2a9ed1cb19310298e3e87ea4b8120a35ddf9199ad372decd826d7a01925af655
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 document body and embedded URLs reinforce this lure, aiming to trick users into visiting the malicious site. While no scripts were extracted, the PDF structure and embedded links strongly indicate a phishing or scam attempt, likely leading to further malware download or credential harvesting.

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/free-robux-actually-works-no-scam-game-hack In PDF document text
    • https://yeushuen.com.tw/image/data/files/free-robux-app-2021_GM431946152.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/free-robux-gift-card_GM431946152.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/roblox-headless-horseman-free_GM431946152.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/roblox-re_GM431946152.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/minecraft-pvp-hacks_GM479516143.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/wahoo-gaming-co-free-robux_GM431946152.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/how-to-get-free-robux-fast_GM431946152.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/coin-master-spin-link-today-free_GM406889139.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/coin-master-hack-cydia_GM406889139.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/free-roblox-printables_GM431946152.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/can-you-get-robux-for-free_GM431946152.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/free-spins-coin-master-no-verification_GM406889139.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/how-to-earn-free-robux_GM431946152.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/how-to-get-free-robux-without-offers_GM431946152.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/coin-master-free-link-2021_GM406889139.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/free-minecraft-thumbnails_GM479516143.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/how-to-get-free-robux-on-mobile_GM431946152.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/youtube-how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/free-roblox-banner-maker_GM431946152.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/minecraft-java-server-hosting-free_GM479516143.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
font_00_sfnt_off000030e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30E4 22936 bytes
SHA-256: 2e0c549a09bc29acb8f31837e010adfc82b0e13dda545e96c33c1ed63a97e4d8
font_01_sfnt_off000064a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64A3 19704 bytes
SHA-256: bd175e96dacdcf04ecaca28054c30c12ba989cd76cd2368e87a01f7d2486f4cb

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