Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd1b13f8aa48d5e8…

MALICIOUS

PDF

41.9 KB Created: 2021-05-13 02:01:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 3934fe82bf4239c38cc72dae40fd9af7 SHA-1: ec8ccdd937ad10e1dd867580858f8873431d1f7c SHA-256: cd1b13f8aa48d5e8b61fefbeb8ef4327eda7b6219b63dac4c84c72f03a52bda6
182 Risk Score

Malware Insights

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

This PDF document is designed to trick users into clicking links that promise game hacks or generators, such as 'gamehunters-coin-master-game-hack'. The document contains a large number of external links, many of which point to other PDFs hosted on a similar domain, suggesting a link farm or redirector strategy. The presence of a fake CAPTCHA heuristic further indicates an attempt to deceive the user into performing an action, likely leading to a malicious download or exploit.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/gamehunters-coin-master-game-hack PDF link annotation
    • https://resmed.ear.com.tw/image/data/files/coin-master-daily-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/free-spins-coin-master-app-iphone_GM406889139.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/free-coin-master-spin-app_GM406889139.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/coin-master-hack-app-android-download_GM406889139.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/robux-free-2021_GM431946152.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/ww-robux_GM431946152.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/minecraft-realms-free-trial_GM479516143.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/pig-master-coin-master-free-spin_GM406889139.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/minecraft-bedrock-download-pc-free_GM479516143.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/coin-master-cheats_GM406889139.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/2021-coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/how-to-get-minecraft-for-free-on-laptop_GM479516143.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/free-spins-in-coin-master-without-human-verification_GM406889139.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/coin-master-free-spins-link-may-2021_GM406889139.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/how-do-i-get-free-robux_GM431946152.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/robux-now_GM431946152.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/how-to-get-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/how-to-get-free-robux-promo-codes_GM431946152.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/free-robux-pin-codes_GM431946152.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/free-spins-and-coins-coin-master-2021-link_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_off0000496f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x496F 24596 bytes
SHA-256: 59f88bd0e99867fea94e1c736f1440989e972a010df24ed15fd7dd969239831e
font_01_sfnt_off00008211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8211 18112 bytes
SHA-256: c2ae28342630407017e32402e5197f88f475abc7b1f150f2e7ca71ade1f6ce7c

Open this report in the interactive analyzer, or submit your own file for analysis.