Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a92c725e8319050…

MALICIOUS

PDF

36.5 KB Created: 2021-05-19 04:08:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 7e11d592a17da8644058b42e0f575160 SHA-1: 8bef5c803fe1e464ef09f6b275e47936510609ef SHA-256: 0a92c725e8319050d8bce77dfc8f6f1e047f36f1a40cffbe8643692c3c92c5a3
130 Risk Score

Malware Insights

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

The PDF document contains a critical heuristic firing for a malicious redirector link, specifically pointing to a 'Coin Master Free Spins' generator. This link is designed to lure users into downloading or accessing further malicious content. The document body also contains similar lures and the application used to generate the PDF (wkhtmltopdf) is sometimes abused for malicious purposes.

Machine Learning

  • Nyx PDF Classifier clean score 0.0312

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/406889139/coin-master-free-spins-and-free-coins-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_003_off0000359d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x359D 25260 bytes
SHA-256: 45293d741d06199a4bbbed2ab9f32c376807040b2e8713490f15359519edc6f7
font_01_sfnt_off00006e2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E2C 18060 bytes
SHA-256: 7f8980b6f3213b204c7b050e62c653166806b65682437d624869b2fc7a4cb6a7

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