Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b942d5eda3d2447…

MALICIOUS

PDF

34.7 KB Created: 2021-07-04 12:33:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 55046b398796b4f6de87da167c503c42 SHA-1: 2cb23bd84c7a3d8c3f598ce60d0375d414579562 SHA-256: 9b942d5eda3d2447f342d3194b3eb519bc437b3c37d61df8dd8cead68b7b3c46
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file employs a common lure of 'free generator / game hack' to entice users to click on a link. The link directs to a known malicious redirector infrastructure, indicating a phishing or scam attempt. The ML classifier strongly flagged this PDF as malicious, and the presence of multiple redirector links reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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/406889139/free-spins-coin-master-apple-game-hack In PDF document text
    • https://library.institutpendidikan.ac.id/repository/how-to-make-good-roblox-thumbnails-for-youtube-free_GM431946152.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/get-free-robloxgg_GM431946152.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/roblox-system32-host-file-hack_GM431946152.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/what-is-a-robux_GM431946152.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/coin-master-exchange-40-free-spins_GM406889139.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/minecraft-redeem-code-free_GM479516143.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/robux-free-2021_GM431946152.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/minecraft-pocket-edition-free-ios_GM479516143.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/today-coin-master-free-coins-link_GM406889139.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/coin-master-free-spin-ml_GM406889139.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/how-to-get-free-robux-promo-codes_GM431946152.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/coin-master-card-hack_GM406889139.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/make-robux-free-robux_GM431946152.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/free-robux-promo-codes-2021_GM431946152.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/how-to-get-1-million-robux-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/card-hack-for-coin-master_GM406889139.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/topkek-hack-roblox_GM431946152.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/coin-master-free-spins-and-coins-app-download_GM406889139.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/roblox-german-flag-tshirt-free_GM431946152.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_off00003274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3274 22708 bytes
SHA-256: ba34288422883ff6696a238ac4e6930a61aacfb3df5436fa14adf37d2cb57676
font_01_sfnt_off0000653b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x653B 18248 bytes
SHA-256: 5fc4058085e688ccbd2e279a6fdf32c136df5194189f80f266052c2afd8c01d6

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