Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef4def3669a33f49…

MALICIOUS

PDF

33.1 KB Created: 2021-07-19 09:54:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 8a89100810f65f7e0831b9a8eda72ba3 SHA-1: a33591157e8935597d00f234f6e1ab20c2222af9 SHA-256: ef4def3669a33f4936dbe7c98f64b9bdb832fb2f6b41b7fca6661f2d852d75cb
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors and lures users with themes like 'free generator / game hack'. The ML classifier also flagged the document as malicious. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9498

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/835599320/free-tiktok-likes-2021-game-hack In PDF document text
    • https://lpk-citranusantara.com/ckfinder/userfiles/files/hacks-roblox_GM431946152.pdfIn PDF document text
    • https://lpk-citranusantara.com/ckfinder/userfiles/files/free-tiktok-followers-no-verification-or-survey_GM835599320.pdfIn PDF document text
    • https://lpk-citranusantara.com/ckfinder/userfiles/files/how-do-i-get-free-robux_GM431946152.pdfIn PDF document text
    • https://lpk-citranusantara.com/ckfinder/userfiles/files/coin-master-free-spins-2021_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
stream_002_off00002849.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2849 24600 bytes
SHA-256: 37daaf4f842d9c7945f7f57684c394c91e3a42aea931357555c1a670ffe478ed
font_01_sfnt_off0000612a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x612A 17860 bytes
SHA-256: d258708121255352d461bbf2ed049085888c1bd8d2af1a740053385592fd2202

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