Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fc5cc48e5a4099f…

MALICIOUS

PDF

46.8 KB Created: 2021-06-03 06:16:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 53ffd16ebbe244aa70228efdbf123976 SHA-1: 674f22fb94b47d2ccc9c2dd50fd3e85639254910 SHA-256: 4fc5cc48e5a4099f439d5a2fe1bd3e992b1f252e1e8f08788ac4f5d9bf770fc2
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a malicious redirector link disguised as a game hack generator, which is a common lure for phishing or malware distribution. The ML classifier also flagged this PDF as malicious. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect the user to a malicious site, likely for further payload delivery or credential harvesting.

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/1094591345/can-pokemon-go-free-download-game-hack In PDF document text
    • https://library.sttbandung.ac.id/repository/coin-master-free-spin-link-today-2021_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/synapses-roblox-exploit-free_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/roblox-free-robux-generator_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/how-to-hack-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/how-to-get-minecraft-for-free-on-ps4-2021_GM479516143.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/how-to-get-free-robux-fast-and-easy_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/coin-master-daily-free-spins-and-coins-link_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/roblox-hacked-version-download_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/roblox-free-clothes-hack_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/www-roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/coin-master-free-spins-link-today-new-2021_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/free-promo-codes-for-robux_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/free-robux-promo-codes-2021_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/roblox-demon_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/roblox-island-royale-hack-script_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/roblox-free-rubox_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/tiktok-free-10-likes_GM835599320.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/free-robux-games-on-roblox_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/how-to-get-free-robux-without-email_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_off000051bc.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51BC 24176 bytes
SHA-256: 6fe13efbe755f11b3aeba27db85c71661e9763ac2d0abb8549d1e5d0f9f0de3f
font_01_sfnt_off000088ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x88EE 2920 bytes
SHA-256: 64c53edae7920bc04119553d13e7f88c7ab8c9d6abd0f5e62be35afdb33f76ff
font_02_sfnt_off00009309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9309 18648 bytes
SHA-256: 78146ce3812f5b084a7ef82385c69ac4658288b6ff82fea4aa3e7458fbbd95bb

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