Malicious PDF — malware analysis report

Static analysis result for SHA-256 15934bae6fe20595…

MALICIOUS

PDF

41.1 KB Created: 2021-05-13 14:54:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: b6c5e33e78de8910b3ad11b967b46813 SHA-1: 0d70cf98e61db0e499d0554d4a75ed8d23c8729d SHA-256: 15934bae6fe205954832ceb57daadd2552aac9c47c44f1ffabf8811f32b3763a
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains multiple heuristics indicating it is a malicious redirector lure, specifically referencing 'free generator / game hack' content. The embedded URL, https://netcdn.xyz/app/431946152/free-robux-apps-that-work-game-hack, is identified as a malicious redirector. The document body also contains text and a call-to-action related to accessing game generators, reinforcing the lure. No scripts were extracted, but the primary attack pattern is a phishing lure via a malicious link.

Machine Learning

  • Nyx PDF Classifier clean score 0.0125

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-robux-apps-that-work-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_off00003401.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3401 27616 bytes
SHA-256: 7b264c099510b26e89af787810ecd7253b61b1cfb74556556ff3b8561f66e2aa
font_01_sfnt_off00007141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7141 3500 bytes
SHA-256: e49a868379cd3c37e631c5a53c010e21f38d803532a2b8417aee82315d4e8634
font_02_sfnt_off00007ce3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7CE3 19056 bytes
SHA-256: 867cc7ed7a05e00a705c8433c5324c57a550f7e7678a2e8c50298e1974253cec

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