Malicious PDF — malware analysis report

Static analysis result for SHA-256 67aaf36fdc535eae…

MALICIOUS

PDF

45.3 KB Created: 2021-05-11 04:46:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 709ae9d7d24d58311dd386742fbdc258 SHA-1: 761aa8b060ff2ec2c3d088442ca63203eba71b80 SHA-256: 67aaf36fdc535eaecca15714ce6a31e4c9e29802f8a14adc59f25dd2a6e9e037
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to a known malicious redirector infrastructure, specifically advertising 'free generator / game hack' content. The document body and embedded links strongly suggest a lure to a scam or potentially a phishing site. No scripts were extracted, but the primary attack vector appears to be social engineering via deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9551

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-no-human-verification-game-hack In PDF document text
    • http://pustaka.polbangtan-gowa.ac.id/repository/coin-master-free-spins-link-2021-march_GM406889139.pdfIn PDF document text
    • http://pustaka.polbangtan-gowa.ac.id//repository/wurst-18-9_GM479516143.pdfIn PDF document text
    • http://pustaka.polbangtan-gowa.ac.id/repository/mosttechs-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://pustaka.polbangtan-gowa.ac.id//repository/free-draw-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.polbangtan-gowa.ac.id/repository/gameoffice-net-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.polbangtan-gowa.ac.id//repository/coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://pustaka.polbangtan-gowa.ac.id//repository/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://pustaka.polbangtan-gowa.ac.id/repository/roblox-sexually_GM431946152.pdfIn PDF document text
    • http://pustaka.polbangtan-gowa.ac.id/repository/free-robux-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.polbangtan-gowa.ac.id//repository/roblox-hack-client_GM431946152.pdfIn PDF document text
    • http://pustaka.polbangtan-gowa.ac.id/repository/rbx-website_GM431946152.pdfIn PDF document text
    • http://pustaka.polbangtan-gowa.ac.id//repository/free-robux-hacker-us_GM431946152.pdfIn PDF document text
    • http://pustaka.polbangtan-gowa.ac.id//repository/free-premium-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.polbangtan-gowa.ac.id//repository/play-coin-master-for-free_GM406889139.pdfIn PDF document text
    • http://pustaka.polbangtan-gowa.ac.id//repository/coin-master-free-spins-generator-no-human-verification_GM406889139.pdfIn PDF document text
    • http://pustaka.polbangtan-gowa.ac.id//repository/roblox-tracker_GM431946152.pdfIn PDF document text
    • http://pustaka.polbangtan-gowa.ac.id//repository/minecraft-free-download-windows_GM479516143.pdfIn PDF document text
    • http://pustaka.polbangtan-gowa.ac.id//repository/coin-master-free-spins-2021-today_GM406889139.pdfIn PDF document text
    • http://pustaka.polbangtan-gowa.ac.id/repository/roblox-mobile-hack_GM431946152.pdfIn PDF document text
    • http://pustaka.polbangtan-gowa.ac.id/repository/free-robux-2021_GM431946152.pdfIn 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_off00004ba0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4BA0 24760 bytes
SHA-256: 55d035796194b02392df7f543580d40cce4377b4d2e305aa5a581fbc45c4ca10
font_01_sfnt_off00008480.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8480 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off00008e32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E32 18420 bytes
SHA-256: bda9d64311803d8ca1e60170c3ec5fa1333a71d10f10bc88962b6478ba2902e6

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