Malicious PDF — malware analysis report

Static analysis result for SHA-256 28ad375a66dee26f…

MALICIOUS

PDF

46.4 KB Created: 2021-06-04 02:58:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 051f0c38c75030771543d2e890bf01bb SHA-1: 024a2195e3518804c6dfb1a6b5ff951f42bda2a1 SHA-256: 28ad375a66dee26fc525d4927098cabd3eabf3bcd3e495af2d142ee5893e7549
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded links that redirect to a known malicious domain, masquerading as a game hack generator. The document body, though partially corrupted, contains a URL that aligns with the heuristic findings of a malicious redirector. The presence of these links suggests an attempt to trick the user into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9748

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.online/app/406889139/free-spin-link-for-coin-master-game-game-hack In PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/coin-master-hack-version-download-2021-android_GM406889139.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/coin-master-link-daily-get-free-spins-amp_GM406889139.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/is-roblox-free-on-nintendo-switch_GM431946152.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/coin-master-heaven-links_GM406889139.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/coin-master-unlimited-spin-link_GM406889139.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/free-100-robux_GM431946152.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/cm-daily-spins_GM406889139.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/coin-master-free_GM406889139.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/how-to-o-get-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/coin-master-golden-cards-hack_GM406889139.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/free-robux-download_GM431946152.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/roblox-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/free-coin-app_GM406889139.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/free-robux-com-real_GM431946152.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/minecraft-svg-free_GM479516143.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/free-robux-with-no-verification_GM431946152.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/coin-master-hack-ios-jailbreak_GM406889139.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/free-coins-and-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/coin-master-links-free-spins_GM406889139.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/how-to-get-minecraft-windows-10-for-free-2021_GM479516143.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_004_off0000509f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x509F 24560 bytes
SHA-256: e0a899d0e1f3b8c5a460efc16af93cdf64b6c7388ec8db82fb3fcf32a8c716fd
font_01_sfnt_off000088e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x88E6 2840 bytes
SHA-256: 30dce2b9c1950da345d7fed8f00c38887adfa2f2ddecc31775af2315e819ac37
font_02_sfnt_off00009299.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9299 18316 bytes
SHA-256: 4ad106dc66915d7a7c54c506e35e2e74cb7406920644c521a55874c4c44ea7c2

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