Malicious PDF — malware analysis report

Static analysis result for SHA-256 087d77e67dcc4f6b…

MALICIOUS

PDF

43.6 KB Created: 2021-05-19 08:01:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 7207012fabe62d063098f520eabb306f SHA-1: b369cb3cac8bf1479354ecb0116348476018ffae SHA-256: 087d77e67dcc4f6b8a541c5076c6f802daf2031ba7d3a0d858eef37fa3ccc7f1
182 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are presented as game hacks or generators, indicating a lure for users to click. The presence of a fake CAPTCHA or human verification prompt further supports this social engineering tactic. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious sites, potentially leading to further exploitation or malware download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9648

Heuristics 6

  • 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.
  • 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/406889139/free-coins-for-coin-master-game-hack PDF link annotation
    • http://apteka-ot-sklada.com.ua/images/coin-master-free-spins-link-march-2021_GM406889139.pdfIn PDF document text
    • http://apteka-ot-sklada.com.ua/images/minecraft-hax-download-no-virus_GM479516143.pdfIn PDF document text
    • http://apteka-ot-sklada.com.ua/images/coin-master-hack-mod-game-download_GM406889139.pdfIn PDF document text
    • http://apteka-ot-sklada.com.ua/images/coin-master-link_GM406889139.pdfIn PDF document text
    • http://apteka-ot-sklada.com.ua/images/roblox-18_GM431946152.pdfIn PDF document text
    • http://apteka-ot-sklada.com.ua/images/pokemon-go-free-trades_GM1094591345.pdfIn PDF document text
    • http://apteka-ot-sklada.com.ua/images/coin-master-free-spins-and-coins-today_GM406889139.pdfIn PDF document text
    • http://apteka-ot-sklada.com.ua/images/coin-master-free-spins-link-without-human-verification_GM406889139.pdfIn PDF document text
    • http://apteka-ot-sklada.com.ua/images/coin-master-free-spin-link-daily_GM406889139.pdfIn PDF document text
    • http://apteka-ot-sklada.com.ua/images/roblox-hacking-website_GM431946152.pdfIn PDF document text
    • http://apteka-ot-sklada.com.ua/images/scaffold-minecraft-hack_GM479516143.pdfIn PDF document text
    • http://apteka-ot-sklada.com.ua/images/free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://apteka-ot-sklada.com.ua/images/coin-master-fb-free-spins-link_GM406889139.pdfIn PDF document text
    • http://apteka-ot-sklada.com.ua/images/free-spin-link-coin-master_GM406889139.pdfIn PDF document text
    • http://apteka-ot-sklada.com.ua/images/free-coins-coin-master-iphone_GM406889139.pdfIn PDF document text
    • http://apteka-ot-sklada.com.ua/images/free-coin-master-game_GM406889139.pdfIn PDF document text
    • http://apteka-ot-sklada.com.ua/images/free-coin-master-gold-cards_GM406889139.pdfIn PDF document text
    • http://apteka-ot-sklada.com.ua/images/how-to-hack-roblox-to-get-robux_GM431946152.pdfIn PDF document text
    • http://apteka-ot-sklada.com.ua/images/legit-coin-master-hack-october-2021_GM406889139.pdfIn PDF document text
    • http://apteka-ot-sklada.com.ua/images/coin-master-hack-spins-game-download_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_003_off0000473d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x473D 24628 bytes
SHA-256: f01622722999f3dbd2b22d4e2e5c4e9c9c91cc9d4e87e084d88cc79b590d89df
font_01_sfnt_off00007f7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F7B 2920 bytes
SHA-256: 601c50867a41b9362538ff18e5f9479a0f9badf698aaf1eb7e88469c11719db7
font_02_sfnt_off00008995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8995 17712 bytes
SHA-256: fd51fa1b849cf95139b510f282bcd47e41e352499df1938c7ca947a320e7b070

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