Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f8d7e3709a52827…

MALICIOUS

PDF

37.2 KB Created: 2021-05-12 08:32:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: ac540d6cf3606c90860743c258c27638 SHA-1: b511c782e5e1d0dcf9954285e5ad5f836cd0650d SHA-256: 8f8d7e3709a528278703be40e4b0bf87b4ed3ae7a3024b425f3dcf22bfea7d7c
92 Risk Score

Malware Insights

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

The PDF file contains a lure for a 'Coin Master Reward Link' and a fake CAPTCHA, designed to trick the user into clicking a link. This link redirects to a malicious URL, likely to download a second-stage payload or lead the user to a phishing site. The document's structure and content strongly suggest a social engineering attack aimed at user interaction.

Machine Learning

  • Nyx PDF Classifier clean score 0.0129

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/406889139/coin-master-reward-link-game-hack PDF link annotation
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000308f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x308F 24076 bytes
SHA-256: 091cf88bbc0cb1557e059db3e49c3ff7debbc2015fa7aab24169bbc0dbc11b76
font_01_sfnt_off00006652.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6652 2880 bytes
SHA-256: 10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132
font_02_sfnt_off0000703d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x703D 18056 bytes
SHA-256: c2793d17727503817a30064ba8beed92adc1bd6ab198ac538296771cbb61b552

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