Malicious PDF — malware analysis report

Static analysis result for SHA-256 c90e7c1bbf931017…

MALICIOUS

PDF

33.4 KB Created: 2021-07-04 22:14:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 918744e7daea5bed26d0d621f9abe8d3 SHA-1: 2f420bd2bf3ebad0006e9e4c2ff3b6c4f4fea948 SHA-256: c90e7c1bbf931017fdda18db645690917bcb5764ea99ef1ecd5a19f47182d5cd
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector, masquerading as a game hack generator. This lure is designed to trick users into visiting the malicious site, likely to download further malware or engage in phishing. The ML classifier strongly supports the malicious nature of this PDF.

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/hacker-minecraft-song-game-hack In PDF document text
    • https://library.sttbandung.ac.id/repository/hack-injector-roblox-granny_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/get-free-robux-now_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/get-free-robux-generator_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/free-robux-hacker-us_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/coin-master-daily-rewards-link_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/invincible-roblox-hack_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/free-robux-no-apps_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/free-robux-easy-and-fast_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/roblox-free-clothes-girl_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/how-to-get-free-robux-without-verification_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/byfanatics-co-free-robux-generator_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/pubg-uc-generator-without-human-verification-2021_GM1330123889.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/coin-master-free-coins-2021_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/groupe-nicdaraiche-free-robux_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/free-roblox-app-how-to-delete_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/free-robux-code-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/how-to-get-free-robux-with-inspect-element_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/roblox-hacked-com-2021_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_off00002f53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F53 22172 bytes
SHA-256: 95a14502611f047c15f79677589520808e89d33c39bf76068476d8bef7d0d415
font_01_sfnt_off0000603a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x603A 18168 bytes
SHA-256: 37e3c409e679a213a10e0592b8ff177cf348fa9834d19b03b17241e7ed0c948b

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