Malicious PDF — malware analysis report

Static analysis result for SHA-256 91820b87b15809bb…

MALICIOUS

PDF

34.1 KB Created: 2021-07-19 15:15:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 916ef3ffb4a2ae135becff94c816f132 SHA-1: 0d1f0019cd37093c5eca309bbbd27dcbd8771417 SHA-256: 91820b87b15809bb766257f73fcae499c94cfed6eddb374f5450f5b1aed3dbbb
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links, including one identified as a malicious redirector pointing to 'http://netcdn.tw/app/479516143/is-minecraft-free-on-xbox-game-hack'. The document body also contains a call-to-action phrase and numerous other URLs, suggesting a phishing or scam attempt. The presence of embedded JavaScript, though not explicitly detailed in the provided evidence, is a common method for executing malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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/is-minecraft-free-on-xbox-game-hack In PDF document text
    • https://infocorrosion.com/images/free-robux-no-offers_GM431946152.pdfIn PDF document text
    • https://infocorrosion.com/images/free-minecraft-games-for-kids_GM479516143.pdfIn PDF document text
    • https://infocorrosion.com/images/how-to-get-free-robux-on-computer_GM431946152.pdfIn PDF document text
    • https://infocorrosion.com/images/how-to-get-minecraft-pe-for-free_GM479516143.pdfIn PDF document text
    • https://infocorrosion.com/images/how-to-host-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • https://infocorrosion.com/images/minecraft-pe-free-apk_GM479516143.pdfIn PDF document text
    • https://infocorrosion.com/images/free-robux-accounts_GM431946152.pdfIn PDF document text
    • https://infocorrosion.com/images/free-views-on-tiktok_GM835599320.pdfIn PDF document text
    • https://infocorrosion.com/images/coin-master-free-spins-link-today-new_GM406889139.pdfIn PDF document text
    • https://infocorrosion.com/images/minecraft-mods-download-free_GM479516143.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_off0000310c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x310C 22688 bytes
SHA-256: 892014e5bd5dcf28abf71085e9811e3dcf94aa216a6924b8b98079d189236beb
font_01_sfnt_off0000634d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x634D 18304 bytes
SHA-256: 19d9535fd2d352d2586ba99854d4ae80d513f2901e16ae506060a78b50b635a9