Malicious PDF — malware analysis report

Static analysis result for SHA-256 4775399d1a1ace8c…

MALICIOUS

PDF

34.3 KB Created: 2021-07-19 21:29:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-25
MD5: e99ef2f1901727d9e9ce750e21ffbfa9 SHA-1: 6d2e269a50cd7f825c932d19320d833ae1aa59a2 SHA-256: 4775399d1a1ace8c8d201a85c00d85c7a45189bd2b1dd5f85c0fcedc34419a7c
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors and other PDFs, masquerading as game hacks or generators. The document body explicitly contains a call to action and directs users to download 'Minecraft Free Download Android' via a provided URL. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://netcdn.tw/app/479516143/minecraft-free-download-android-game-hack In PDF document text
    • http://iacfhouston.com/images/minecraft-dungeons-free_GM479516143.pdfIn PDF document text
    • http://iacfhouston.com/images/coin-master-free-soins_GM406889139.pdfIn PDF document text
    • http://iacfhouston.com/images/blox-fish-free-robux_GM431946152.pdfIn PDF document text
    • http://iacfhouston.com/images/minecraft-hacks-115-2_GM479516143.pdfIn PDF document text
    • http://iacfhouston.com/images/how-to-get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://iacfhouston.com/images/minecraft-java-edition-free_GM479516143.pdfIn PDF document text
    • http://iacfhouston.com/images/coin-master-free-spins-and-coins-daily_GM406889139.pdfIn PDF document text
    • http://iacfhouston.com/images/minecraft-launcher-free_GM479516143.pdfIn PDF document text
    • http://iacfhouston.com/images/robux-hack-tools_GM431946152.pdfIn PDF document text
    • http://iacfhouston.com/images/haktuts-coin-master-free-daily-spins_GM406889139.pdfIn 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
font_00_sfnt_off00002f53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F53 23348 bytes
SHA-256: 04f691621be1c157df9d2ef770ecc0ffe527b78c8321335cbe952a2a8585ea7f
font_01_sfnt_off00006421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6421 18292 bytes
SHA-256: 9d9b0ee832c8ed03a3e8d039feca9f5c484872876758be0788389d8bcd5131f0

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