Malicious PDF — malware analysis report

Static analysis result for SHA-256 3977cd458eba1cea…

MALICIOUS

PDF

45.3 KB Created: 2021-06-04 02:52:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 7c3c0bf335d6596364d5d5d1cd2f2df9 SHA-1: 0ced38ad101943d0e15f75f1898664391d64f295 SHA-256: 3977cd458eba1ceae01b63b6f76beadb7287cddf4f3a50af9e3ad641d1b48156
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links to a known malicious redirector infrastructure, specifically advertising 'game hacks' and 'free generators'. The ML classifier also flagged this PDF as malicious. The primary attack pattern involves luring the user to click on these links, which likely leads to further malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9804

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-free-spin-and-coin-game-hack In PDF document text
    • http://perpus.wdh.ac.id//repository/how-to-get-minecraft-for-free-on-ipad_GM479516143.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/free-robux-android_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id//repository/coin-master-spin-pattern_GM406889139.pdfIn PDF document text
    • http://perpus.wdh.ac.id//repository/how-to-get-free-robux-for-free_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id//repository/how-to-get-gold-cards-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/roblox-rape-hack_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id//repository/download-coin-master-hack-mod-apk_GM406889139.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/roblox-fun-robux_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id//repository/multiplayer-master-hack-coins_GM406889139.pdfIn PDF document text
    • http://perpus.wdh.ac.id//repository/coin-master-hacks_GM406889139.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/free-daily-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.wdh.ac.id//repository/free-spins-and-coins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://perpus.wdh.ac.id//repository/pokemon-go-free-game_GM1094591345.pdfIn PDF document text
    • http://perpus.wdh.ac.id//repository/roblox-gift-card-for-free_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id//repository/coin-master-villages_GM406889139.pdfIn PDF document text
    • http://perpus.wdh.ac.id//repository/roblox-hack-codes_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id//repository/coin-master-free-online-game_GM406889139.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/free-spins-in-coin-master-without-human-verification_GM406889139.pdfIn PDF document text
    • http://perpus.wdh.ac.id//repository/free-spins-coin-master-android_GM406889139.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/pubg-uc-egypt_GM1330123889.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_off00004d81.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4D81 24280 bytes
SHA-256: e648b5030ecc867dc0dd3cbb47716fa582319b93b7f1d44e5e8dfcf690db9786
font_01_sfnt_off000084f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84F0 2840 bytes
SHA-256: 30dce2b9c1950da345d7fed8f00c38887adfa2f2ddecc31775af2315e819ac37
font_02_sfnt_off00008ea3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8EA3 18060 bytes
SHA-256: 7f8980b6f3213b204c7b050e62c653166806b65682437d624869b2fc7a4cb6a7

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