Malicious PDF — malware analysis report

Static analysis result for SHA-256 1072773fd17b768a…

MALICIOUS

PDF

47.6 KB Created: 2021-06-03 09:51:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: c20a425cfba50f1b9603795d398cfa2b SHA-1: 898c4905e7e35202e612768420cacca5c64a2b6b SHA-256: 1072773fd17b768a4da6e42ef6da49a990a1c1ca79189562190168f92d81a1d5
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it links to malicious redirector infrastructure, specifically promoting a 'game hack' or 'free generator' lure. The embedded URL directs to a known malicious domain, likely intended to lead users to a scam or further malware. The ML classifier also strongly flagged this PDF as malicious.

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/coin-master-codes-game-hack In PDF document text
    • http://library.umla.ac.id/repository/you-promised-my-son-free-robux_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/roblox-free-wings_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/working-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/how-to-pubg-uc-carding_GM1330123889.pdfIn PDF document text
    • http://library.umla.ac.id/repository/how-to-get-free-coins-and-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/roblox-sexually_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/hacked-roblox-game_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/free-online-minecraft-server_GM479516143.pdfIn PDF document text
    • http://library.umla.ac.id//repository/coin-master-free-spin-link-today-16-11-2021_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/coin-master-free-spins-11-01-2021_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/roblox-website-robux_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/how-to-get-free-spins-on-coin-master-game_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/coin-master-invite-friends-free-spins_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/hackear-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/roblox-no-download-hack_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/hack-my-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/coin-master-free-100-spin_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/how-to-change-your-name-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/best-hack-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/how-to-get-free-coins-on-coin-master-hack_GM406889139.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_off0000519d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x519D 27012 bytes
SHA-256: bfba3976323e34bf71b1ae717dde8d5210d18767a1e5b9f5f72ba69e2b5b1bee
font_01_sfnt_off00008f2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F2E 2812 bytes
SHA-256: 869414959d7b492e0f799b560e1731e3ab498bd286c28e9f0d2ec33d9b6cf53d
font_02_sfnt_off000098cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x98CC 17720 bytes
SHA-256: e3dc30cd69473f08b9483bb660e9aeaccc8f6f74c3e4f353697525059d592d8d

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