Malicious PDF — malware analysis report

Static analysis result for SHA-256 353774e6d4b7c0f3…

MALICIOUS

PDF

38.9 KB Created: 2021-05-22 00:10:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 9c1a455d987a9f0b96142a33a7bd98f0 SHA-1: 25dc063af70761844470b79b1ecc2383bdd76b00 SHA-256: 353774e6d4b7c0f33ed1f802aed4b7a028152c4f84bf1141c213f63f732911f3
200 Risk Score

Malware Insights

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

The PDF document contains multiple links and a call-to-action to a generator for 'Roblox Hack 2021', impersonating the Apple brand. These links redirect to known malicious infrastructure, indicating a credential phishing or malware distribution attempt. The document body and embedded links suggest a lure for game-related cheats or hacks, which is a common tactic for credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9476

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/roblox-hack-2021-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/roblox-hack-2021-game-hack In PDF document text
    • http://balkanin.com/images/best-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://balkanin.com/images/is-it-possible-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://balkanin.com/images/coin-master-spin-blogspot_GM406889139.pdfIn PDF document text
    • http://balkanin.com/images/earn-robux-today-earn-robux-today_GM431946152.pdfIn PDF document text
    • http://balkanin.com/images/how-to-become-a-hacker-in-roblox_GM431946152.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_002_off000034ed.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x34ED 28144 bytes
SHA-256: 8bd53f12e36e3bd218fc4cfc221e0e7ae2c19f907477c6606df981771b4785a7
font_01_sfnt_off000075a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x75A2 18584 bytes
SHA-256: 2941163c9806e22b58ea5552aa71059231a9f2c3bbffbca0ecd460ca17501cff

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