Malicious PDF — malware analysis report

Static analysis result for SHA-256 e83c90a593a0daa7…

MALICIOUS

PDF

46.8 KB Created: 2021-06-03 05:18:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 38e3191265864aab073be84044c41fd4 SHA-1: d942c2f9ef090f2c918d3edc52d31602f9fec87f SHA-256: e83c90a593a0daa75e228cfb7691f21757c42fc04eaca6bc39dd63d5c38738f2
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating malicious redirector links, specifically luring users with 'free generator / game hack' content. The embedded URL leads to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains references to the same malicious URL, reinforcing the phishing and redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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/how-to-get-stuff-that-cost-coins-free-mpe-master-game-hack In PDF document text
    • https://library.sttbandung.ac.id/repository/free-op-minecraft-servers_GM479516143.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/lazyblox-com-free-robux_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/free-robux-no-generator_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/free-robux-hack-generator_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/i-got-hacked-on-roblox_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/rbx-free-robux_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/how-to-get-free-robux-without-verifying_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/coin-master-free-spins-app_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/minecraft-free-install_GM479516143.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/how-can-i-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/how-to-get-free-robux-on-mobile_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/roblox-fly-hack_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/coin-master-free-link-spin_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/free-robux-no-verify_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/coin-master-15-free-spin-link-of-last-5-days_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/free-robux-wheel_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/how-to-get-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/roblox-comroblox_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_004_off000051cd.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51CD 25544 bytes
SHA-256: 371134da6e1c5fd3f29f68482008252157da857fa8dfb53d0e0acca171973041
font_01_sfnt_off00008a6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A6D 2840 bytes
SHA-256: 30dce2b9c1950da345d7fed8f00c38887adfa2f2ddecc31775af2315e819ac37
font_02_sfnt_off00009420.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9420 18356 bytes
SHA-256: ab7e05fa8a6f86841f1e53738495526d924db055e1527cfc13c4cf2d324dcb8e

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