Malicious PDF — malware analysis report

Static analysis result for SHA-256 14451a78d2ea2575…

MALICIOUS

PDF

43.2 KB Created: 2021-05-15 08:55:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 3c6953a3ade65b8aa76c8cfa81c7de0d SHA-1: 82f8bebf8936c68286406821ad7fc45dae16bd54 SHA-256: 14451a78d2ea25752a91ce2d34b68cc4a33502d49b5e04bb1e90e45df96f9221
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to websites offering game hacks and free currency, including a primary link to a known malicious redirector. The document body and heuristics indicate a lure for free Robux and game cheats, likely serving as a phishing or malware distribution mechanism. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 5

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/how-to-get-2021-robux-for-free-game-hack In 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/minecraft-pocket-edition-free-download_GM479516143.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/play-coin-master_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/cute-free-roblox-outfits_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-spins-and-coins-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/mosttechs-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-spin-hack-apk_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/how-to-get-minecraft-for-free-on-tablet_GM479516143.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/roblox-april-fools-hack_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/roblox-free-bundles_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-coinmaster-spins_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/easy-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-free-coins-and-spins-today_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/how-to-get-free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-free-spins-hack_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-robux-without-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-hackhub-coin-master_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/how-to-get-free-robux-without-email_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/minecraft-xbox-360-free-download-code_GM479516143.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/card-hack-for-coin-master_GM406889139.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
stream_003_off000049bc.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49BC 25560 bytes
SHA-256: 63f39e6ed6a5776ac4fb86c75a90ca1b06cd9efda16bbd1822c50c471b51743e
font_01_sfnt_off0000854c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x854C 18684 bytes
SHA-256: 6e9c0eecafd635f65838c8dbfb1e23e8457e4c9239d4b33e445d621fd980b18f

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