Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ef8b5a0b72dac5d…

MALICIOUS

PDF

34.9 KB Created: 2021-07-03 16:47:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 119fb5b30294b7a92a4a0e3b39dd93f8 SHA-1: 5875c2cf6f2920b9aa10a58d5d7164d30b7d9219 SHA-256: 3ef8b5a0b72dac5da6f0addeb8cc2d6c5a353755695a775ff92c9d94e3329744
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded URLs, including a critical link to a known malicious redirector infrastructure at http://netcdn.tw/app/479516143/minecraft-free-download-chromebook-game-hack. The document body and heuristics indicate a lure related to free game currency and hacks, designed to entice users to click the malicious link. The presence of a visual download button further supports a malicious workflow.

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/minecraft-free-download-chromebook-game-hack In PDF document text
    • https://library.institutpendidikan.ac.id/repository/free-robux-with-no-human-verification_GM431946152.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/rewardrobux-com_GM431946152.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/tradlands-roblox-cheats-tricks_GM431946152.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/roblox-what-day-is-restarunt-tycoon-2-coming-for-free_GM431946152.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/roblox-veil-hack_GM431946152.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/free-robux-human-verification_GM431946152.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/roblox-tycoon-hack-2021_GM431946152.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/robloxwin-free-robux_GM431946152.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/best-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/new-robux-hack_GM431946152.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/is-there-a-free-way-to-change-roblox-name_GM431946152.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/how-to-hack-roblox-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/how-to-get-free-bc-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/bloxawards-com-earn-free-robux_GM431946152.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/free-robux-us_GM431946152.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/free-robux-no-anti-bot-verification_GM431946152.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/free-robux-glitch-2021_GM431946152.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/how-to-get-robux-fast-hack_GM431946152.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/thebesian-get-roblox-ninja-animation-free_GM431946152.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/hack-coin-master-apk-2021_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
font_00_sfnt_off00003225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3225 22116 bytes
SHA-256: 10271dcc7943e41d56f239bedccf0858ad643d197b407af0ce3bcfdf19f15565
font_01_sfnt_off000062f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62F2 19332 bytes
SHA-256: 4d7e6a8ad3ab477c7586955708d040336cfd9a5a5d373cde419f68ec141d9187

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