Malicious PDF — malware analysis report

Static analysis result for SHA-256 d83fc0994a427e6a…

MALICIOUS

PDF

34.6 KB Created: 2021-05-24 11:33:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 0c51481588fd6b54092bde4f2cc7d6c5 SHA-1: 51e125b6aa08883106ddce0140ce314491180c6e SHA-256: d83fc0994a427e6afc497f65e24e75c46abfbdbb79b0b0eb4d73fe96412f84a4
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure for free game currency, which is a common social engineering tactic to trick users into clicking malicious links. The embedded URL points to a known malicious redirector, indicating an attempt to lead the user to a harmful site. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier clean score 0.0718

Heuristics 4

  • 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.
  • 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-roblox-accounts-with-robux-that-work-not-banned-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_002_off00002bd1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2BD1 24204 bytes
SHA-256: 50db15dd061ed4a5947b7ff14689fa5824f76a2f8e2f0e190d565102072e6056
font_01_sfnt_off0000633a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x633A 19248 bytes
SHA-256: efa3c9b2c8f55d2ce8a78f8ae751aa117ac14b1934403b15023fd1527a527783

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