Malicious PDF — malware analysis report

Static analysis result for SHA-256 401546d6a8cc2659…

MALICIOUS

PDF

35.4 KB Created: 2021-07-09 19:51:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 3ddb10855dec8597371181ddc88fe55e SHA-1: a83cf346ae53429d946f3a5f97d48df252d1b495 SHA-256: 401546d6a8cc26593fdf66a820be0d43f593de078622bf04c7e8a36076b54ca6
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a prominent link disguised as a 'free generator / game hack' for Coin Master, which redirects to known malicious infrastructure. This lure, combined with the ML classifier flagging the PDF as malicious, strongly suggests a social engineering attack aimed at tricking users into visiting a harmful site. No scripts were extracted, but the embedded URL is the primary indicator of malicious intent.

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.tw/app/406889139/play-coin-master-online-free-game-hack In PDF document text
    • http://www.peterbarsony.com/userfiles/files/free-roblox-shirt-templates-2021_GM431946152.pdfIn PDF document text
    • http://www.peterbarsony.com/userfiles/files/how-to-hack-into-someones-roblox-account_GM431946152.pdfIn PDF document text
    • http://www.peterbarsony.com/userfiles/files/coin-master-apk-hack-32_GM406889139.pdfIn PDF document text
    • http://www.peterbarsony.com/userfiles/files/cheat-roblox-madcity-money_GM431946152.pdfIn PDF document text
    • http://www.peterbarsony.com/userfiles/files/getrobux-info_GM431946152.pdfIn PDF document text
    • http://www.peterbarsony.com/userfiles/files/flame-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://www.peterbarsony.com/userfiles/files/free-robux-images_GM431946152.pdfIn PDF document text
    • http://www.peterbarsony.com/userfiles/files/roblox-infinite-jjump-script-hack_GM431946152.pdfIn PDF document text
    • http://www.peterbarsony.com/userfiles/files/coinmaster-spin-ml-link_GM406889139.pdfIn PDF document text
    • http://www.peterbarsony.com/userfiles/files/give-me-free-robux_GM431946152.pdfIn PDF document text
    • http://www.peterbarsony.com/userfiles/files/coin-master-spin-hack_GM406889139.pdfIn PDF document text
    • http://www.peterbarsony.com/userfiles/files/get-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://www.peterbarsony.com/userfiles/files/free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://www.peterbarsony.com/userfiles/files/bit-ly-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://www.peterbarsony.com/userfiles/files/roblox-avatar-girl_GM431946152.pdfIn PDF document text
    • http://www.peterbarsony.com/userfiles/files/free-robux-hack-no-verification_GM431946152.pdfIn PDF document text
    • http://www.peterbarsony.com/userfiles/files/free-robux-skin_GM431946152.pdfIn PDF document text
    • http://www.peterbarsony.com/userfiles/files/youtube-project-pokemon-roblox-hack-legebds_GM431946152.pdfIn PDF document text
    • http://www.peterbarsony.com/userfiles/files/best-hack-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://www.peterbarsony.com/userfiles/files/roblox-game-hack-commands_GM431946152.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_002_off000032b1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x32B1 23420 bytes
SHA-256: 467867adf017a10f54072d729efe6c03f3aadb37abdd80f93cc0b202970e8622
font_01_sfnt_off000067ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67AB 18408 bytes
SHA-256: 9015e46d5427cc1d6d416ff5b07054182491b86373602b8fa3acb77d152d378f

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