Malicious PDF — malware analysis report

Static analysis result for SHA-256 52150e56b39dbe92…

MALICIOUS

PDF

47.5 KB Created: 2021-06-04 04:17:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 881f4a095ec529551ae406bf810c3e20 SHA-1: 0a50ef5485fe00e624247833179cb433191e39f8 SHA-256: 52150e56b39dbe923860fae3bc8456056f2732c27bdd18274fe9834f9d2cef7c
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to a malicious website, disguised as a 'free generator / game hack'. The presence of these links and the ML classifier's high confidence score indicate a malicious intent to lure users to a potentially harmful site. No scripts were extracted, but the document's structure and embedded URLs strongly suggest a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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/431946152/free-robux-no-password-game-hack In PDF document text
    • http://library.ft.upnvj.ac.id/repository/robux-free-2021_GM431946152.pdfIn PDF document text
    • http://library.ft.upnvj.ac.id/repository/free-robux-pins_GM431946152.pdfIn PDF document text
    • http://library.ft.upnvj.ac.id/repository/make-your-own-minecraft-server-free_GM479516143.pdfIn PDF document text
    • http://library.ft.upnvj.ac.id/repository/robux-websites-that-work_GM431946152.pdfIn PDF document text
    • http://library.ft.upnvj.ac.id/repository/coin-master-free-spin-software_GM406889139.pdfIn PDF document text
    • http://library.ft.upnvj.ac.id/repository/free-robux-com-2021_GM431946152.pdfIn PDF document text
    • http://library.ft.upnvj.ac.id/repository/how-to-get-free-robux-without-downloading-apps_GM431946152.pdfIn PDF document text
    • http://library.ft.upnvj.ac.id/repository/roblox-free-hair-girl_GM431946152.pdfIn PDF document text
    • http://library.ft.upnvj.ac.id/repository/how-to-get-minecraft-bedrock-edition-for-free_GM479516143.pdfIn PDF document text
    • http://library.ft.upnvj.ac.id/repository/wurst-hacked-client_GM479516143.pdfIn PDF document text
    • http://library.ft.upnvj.ac.id/repository/robux-without-verification_GM431946152.pdfIn PDF document text
    • http://library.ft.upnvj.ac.id/repository/free-robux-mobile_GM431946152.pdfIn PDF document text
    • http://library.ft.upnvj.ac.id/repository/coin-master-spin-hack-apk_GM406889139.pdfIn PDF document text
    • http://library.ft.upnvj.ac.id/repository/como-hackear-coin-master-iphone_GM406889139.pdfIn PDF document text
    • http://library.ft.upnvj.ac.id/repository/master-hack-coin_GM406889139.pdfIn PDF document text
    • http://library.ft.upnvj.ac.id/repository/links-for-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://library.ft.upnvj.ac.id/repository/how-to-get-free-roblox_GM431946152.pdfIn PDF document text
    • http://library.ft.upnvj.ac.id/repository/how-to-get-minecraft-for-free-on-mac_GM479516143.pdfIn PDF document text
    • http://library.ft.upnvj.ac.id/repository/coin-master-apk-mod-hack-download_GM406889139.pdfIn PDF document text
    • http://library.ft.upnvj.ac.id/repository/free-coins-coin-master-spins_GM406889139.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
stream_004_off0000512b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x512B 30108 bytes
SHA-256: 2728b6408ca069a16519aa3380799723151c2cd7d349b044872e41924c2d7444
font_01_sfnt_off0000960b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x960B 18732 bytes
SHA-256: b254955316d184f98c6f6070526605807868e3146c8b9e5f8ca39f20861b2296

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