Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cbc0754c8dfde24…

MALICIOUS

PDF

35.5 KB Created: 2021-05-23 04:08:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: c2d7541b6560ea5c975f4a329af5f4ee SHA-1: e69817d20c6ef050b5387628a90464d1c90e7e5e SHA-256: 0cbc0754c8dfde24824e0485abe3d62556da069dfa9103586261c42da41f80e9
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. It uses a fake-CAPTCHA lure. 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 5

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/835599320/free-tiktok-followers-no-downloads-game-hack PDF link annotation
    • http://apteka-ot-sklada.com.ua/images/coin-master-free-spins-reddit_GM406889139.pdfIn PDF document text
    • http://apteka-ot-sklada.com.ua/images/coin-master-free-spins-link-today-twitter_GM406889139.pdfIn PDF document text
    • http://apteka-ot-sklada.com.ua/images/free-roblox-clothes_GM431946152.pdfIn PDF document text
    • http://apteka-ot-sklada.com.ua/images/free-roblox-accounts-2021-with-robux_GM431946152.pdfIn PDF document text
    • http://apteka-ot-sklada.com.ua/images/free-robux-without-survey_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_off000032d8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x32D8 23968 bytes
SHA-256: f2bc973aa635f3f90103b4d88ddc3fc3944ba51326679b028e49480cd2aced71
font_01_sfnt_off0000697e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x697E 18264 bytes
SHA-256: d5c5ec98edba9b40f9bc8010b923702a5e25c64ded77377ab4934560472c0c7c

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