Malicious PDF — malware analysis report

Static analysis result for SHA-256 a32b1cb7f8ca334c…

MALICIOUS

PDF

36.2 KB Created: 2021-05-21 10:43:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: c0461642edfa1996d4cb4bd181d5eb3e SHA-1: b73df55b0bac7b3bd99233fdff63efdad4d2d3f5 SHA-256: a32b1cb7f8ca334ca42049a8e304dc9a545ae2f76e78ad84a6f8314e086b212b
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9492

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/406889139/2021-free-spins-coin-master-game-hack PDF link annotation
    • http://ycstamping.com.tw/image/data/files/easy-roblox-today_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-daily-free-spins-link-app_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/roblox-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/play-minecraft-pocket-edition-for-free_GM479516143.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/how-do-i-get-free-spins-on-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_002_off0000347c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x347C 24640 bytes
SHA-256: 9ea0786eddefd282a3525f7134f1a17b531c32a3c66188c6f4d0b94f9fb2d44c
font_01_sfnt_off00006c2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C2C 18288 bytes
SHA-256: d5a46c40ddaffffdec7b194e78d64597afed9f46b5e12e45e50a00bb771aa4a6

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