Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8758b23c5fe5831…

MALICIOUS

PDF

39.8 KB Created: 2021-05-11 03:09:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 5d38a01596b3b14301909869b7d094b0 SHA-1: d23b8681c8b6e953914888bc4e6d574ac66be037 SHA-256: f8758b23c5fe58318664be592894dc90b3e532eb0855566dd808cc988b2f47b5
170 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1553.005 Mark-of-the-Web Bypass

The PDF file contains multiple links that redirect to a malicious domain, identified as a game hack generator lure. This lure is also used in conjunction with brand impersonation, specifically UPS, to facilitate credential phishing. The embedded links and the nature of the lure suggest an attempt to trick users into visiting a compromised site, likely to steal credentials or deliver a secondary payload.

Machine Learning

  • Nyx PDF Classifier clean score 0.0128

Heuristics 5

  • 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.
  • 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-shirts-on-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-shirts-on-roblox-game-hack In 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_off00003635.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3635 25016 bytes
SHA-256: 4b6758955399c4e54886be993fdab88e3fad2684fe32622174f61a784228b7c6
font_01_sfnt_off00006f7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F7A 2816 bytes
SHA-256: 4555740682277f0055d57b15bd0ba953e5b51415ea3d21c93db391eace072d4f
font_02_sfnt_off0000798b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x798B 18500 bytes
SHA-256: 0913aca000174c5e77b5d0e65f3ee2ebb36c614e623a410724f75da42fa667ca

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