Malicious PDF — malware analysis report

Static analysis result for SHA-256 88b2acee8553b02e…

MALICIOUS

PDF

34.0 KB Created: 2021-07-05 08:58:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 63e86eeb7b70eeda94f57aafe9b8af30 SHA-1: ba6075fcd955b29b592aa1aafe0d551187a06f21 SHA-256: 88b2acee8553b02ea5ca984c997fbbb4a8def15d15dfedfd5f937275d87dfa20
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure for free game hacks and generators, directing users to the URL http://netcdn.tw/app/479516143/free-minecraft-thumbnails-game-hack. This URL is identified as a malicious redirector, indicating a phishing or scam attempt. The presence of embedded URLs and the ML classifier's high confidence score support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/479516143/free-minecraft-thumbnails-game-hack In PDF document text
    • https://perpus.upp.ac.id/digilib/repository/free-downloads-for-coin-master-daily-rewards_GM406889139.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/microsoft-rewards-robux_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/coin-master-free-2021-spin-link_GM406889139.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/minecraft-gun-mod-download-free_GM479516143.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/how-to-get-free-robux-on-roblox-no-download_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/free-spins-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/roblox-comcom_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/free-robux-groups-2021_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/free-robux-websites-no-human-verification_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/roblox-robux-hack-computer_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/change-roblox-username-free_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/backpacking-hack-roblox_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/coin-master-free-coins-2021_GM406889139.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/promo-codes-roblox-free-stuff_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/coin-master-hacks_GM406889139.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/get-free-cards-for-coin-master_GM406889139.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/hack-coin-master-apk-33_GM406889139.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/free-mod-apk-coin-master_GM406889139.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/is-there-a-way-to-get-free-bc-on-roblox_GM431946152.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
font_00_sfnt_off00003169.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3169 21812 bytes
SHA-256: 76e2dbdfe25b07938553c128d9c25941e0897121c2a86cc285351c6ee72d59d9
font_01_sfnt_off0000615e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x615E 18652 bytes
SHA-256: 8cb94b06f77e1baa2d49adc168d2190632a611d700f1536995b593d613ae9b0b

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