Malicious PDF — malware analysis report

Static analysis result for SHA-256 f38359c2d886cfed…

MALICIOUS

PDF

37.6 KB Created: 2021-06-04 00:45:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 504a501529b59b5df8d7a7ec92ee71f6 SHA-1: adc55b46bbec3ce6db848cbe252135c770e80b4d SHA-256: f38359c2d886cfede81afa3f3097b53fa0d01f3e3f00727b14c1ae3205acab3e
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a lure for free in-game currency, directing users to a URL associated with malicious redirector infrastructure. This suggests an attempt to trick users into visiting a potentially harmful website, likely for further exploitation or credential harvesting. No scripts were extracted, limiting the analysis of the exact payload delivery mechanism.

Machine Learning

  • Nyx PDF Classifier clean score 0.0292

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.online/app/406889139/how-to-get-free-coins-and-free-spins-coin-master-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_004_off000037fa.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x37FA 25128 bytes
SHA-256: 4cf4885d8437ebde5f3b975e0c444344e9c60409c2c91346369f221f30152d3d
font_01_sfnt_off0000716b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x716B 18224 bytes
SHA-256: 6ff065ff9cf4369595bb0f81e6036a3cab0df59e99953b81d0b04354ed6a0bad

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