Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f875285337e9de1…

MALICIOUS

PDF

46.1 KB Created: 2021-05-14 14:30:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: d53ebf373e339ab0f5343bd00161d4ac SHA-1: 5a986bb768dc651f8efd14e6e894c9c0ee56496d SHA-256: 7f875285337e9de11bf4e36ddf82ed76096b688d85ab30921a2919a84e8117c4
170 Risk Score

Malware Insights

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

The PDF document contains embedded links and text that mimic a "Roblox Robux Hack" generator, aiming to trick users into clicking the link. The heuristic firings indicate that the link leads to a malicious redirector and that the document displays a fake CAPTCHA to further deceive the user into interaction. The primary malicious URL identified is https://netcdn.xyz/app/431946152/roblox-robux-hack-game-hack.

Machine Learning

  • Nyx PDF Classifier clean score 0.0126

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.
  • 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
  • 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-robux-hack-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_off000038ba.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x38BA 27224 bytes
SHA-256: 925ba3b2750a55393faa05d869e2a67a11afba0ef4af1257268d22ffaddcff25
font_01_sfnt_off00007835.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7835 8376 bytes
SHA-256: 092b7a11ef2af93d0b61b37032e6f669359ea7bc5bcb682d43a712f599a5ca39
font_02_sfnt_off00009303.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9303 18320 bytes
SHA-256: fa424f86a9ddd472d540fc30f07119be4b576a9306b5f7bb82c207f2bb92a2b4

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