Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8146c740b20e896…

MALICIOUS

PDF

49.0 KB Created: 2021-06-03 08:57:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: cf8f298e5095bf61a8bd4747e553b145 SHA-1: 8807ecdb900dc788ca44428fd3dd85a93114aad7 SHA-256: c8146c740b20e896618f6abf0f9fee5447270709d44bb4b65d79ac94cf1d5485
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links, including one to a known malicious redirector, designed to lure users into clicking for game hacks or free currency. The primary malicious URL identified is https://netcdn.online/app/431946152/how-to-get-free-robux-easy-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest a phishing or social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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.online/app/431946152/how-to-get-free-robux-easy-game-hack In PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-free-pet-food-links_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-free-coins-and-spins-app_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/moonactive-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/freegames911com-coinmastertipsandcheats2021freecoinsandspins_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-heaven-free-spins-today_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/pubg-uc-redeem-code_GM1330123889.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-robux-discord-servers_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/roblox-robux-hack_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/minecraft-creative-mode-free_GM479516143.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/how-to-get-free-spins-in-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/easy-robux-today_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/pubg-uc-kuwait_GM1330123889.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-free-gifts_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-cheat-codes-for-coin-master_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/how-to-get-minecraft-for-free-2021_GM479516143.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/how-to-change-your-username-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/how-to-play-minecraft-online-for-free_GM479516143.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/hack-to-protect-village-on-coin-master_GM406889139.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_004_off000051c4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51C4 26820 bytes
SHA-256: 043e75abeb426ccb5dcf733a1c55bce4401032d33339d3d936d997315e2efc9c
font_01_sfnt_off00008ed7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8ED7 3884 bytes
SHA-256: 40b61f8938bd710dc29dc58ba3fde91c245a6a69596ec569b4d27c769ca417cf
font_02_sfnt_off00009b7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9B7F 18688 bytes
SHA-256: afa93f6b5b78c11c56913a3e0021d293f85f1b4278f41e2b8713ad9a89f051de

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