Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a6e4a987728a1ff…

MALICIOUS

PDF

38.2 KB Created: 2021-05-10 12:01:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: f7f01c49f4055c3e53d3a8bc72c05968 SHA-1: 5751c821b8d7812011b1cb67b8d3a50d499e12af SHA-256: 4a6e4a987728a1ffae60bd31a2213be0af85fb55a5f2f15c892a4e3b5f30aa77
210 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a lure related to 'free generator / game hack' and impersonates Facebook, directing users to a malicious URL. It also presents a fake CAPTCHA to trick users into interacting with the document, likely to facilitate further malicious actions such as credential harvesting or payload delivery. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier clean score 0.0334

Heuristics 6

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://netcdn.xyz/app/431946152/how-to-get-free-pets-in-adopt-me-roblox-game-hack.
  • 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
  • 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/431946152/how-to-get-free-pets-in-adopt-me-roblox-game-hack In 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_off000033d6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x33D6 27684 bytes
SHA-256: c78782578af56c285c13845e25ace895de32ca35425c8047c93d33ba9bcf3a8b
font_01_sfnt_off00007209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7209 18916 bytes
SHA-256: ddf32d21812ca42913bb48f22a0284a59638f2c0abe9b9b8a3ace66687a9859d

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