Malicious PDF — malware analysis report

Static analysis result for SHA-256 203dcc992f738d42…

MALICIOUS

PDF

36.5 KB Created: 2021-05-10 10:52:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 44c67481869f651f7011408c415916b2 SHA-1: 002b29953958c26a7a66ea364a1610a4c0557a30 SHA-256: 203dcc992f738d42f9d93d078cbea99889f37de05e175750aabf5d3465f21b59
210 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1534 Steal Session Token

The PDF contains a critical heuristic firing for a redirector lure, specifically linking to a "free Dominus Roblox game hack". This lure is also flagged as a brand impersonation credential phishing attempt, impersonating Microsoft, and a lure for MFA/one-time code harvesting. The embedded URL is the primary indicator of compromise, leading to a site that likely hosts a phishing page.

Machine Learning

  • Nyx PDF Classifier clean score 0.0312

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.
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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/free-dominus-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/free-dominus-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_off00003342.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3342 24856 bytes
SHA-256: 89fdb1aedc00062e3dbfed7f29d54291411c17af921626e9e703c7c3a1fc51c3
font_01_sfnt_off00006c3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C3A 18636 bytes
SHA-256: 46fcbd6c3115277ac11b91f3289357a32fe2ba94719b4dbd56ea725e5d096b3c

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