Malicious PDF — malware analysis report

Static analysis result for SHA-256 a443123315b79d64…

MALICIOUS

PDF

34.7 KB Created: 2021-06-19 12:31:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 54efd4ee1281c44c26e1edcf24f2ede8 SHA-1: 970ebff7530f6385b6ad6981a69d840e4fc9f413 SHA-256: a443123315b79d6469d554726591279c4281adb07fdebb37d19d0aeecb9699c7
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous links to external websites, many of which are hosted on domains associated with malicious redirectors. The document body and extracted URLs suggest a lure related to free game currency (Robux) and game hacks, indicating a phishing or malware distribution attempt. The presence of multiple redirector links and the ML classifier output strongly support a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.co/app/431946152/how-can-we-get-free-robux-game-hack In PDF document text
    • http://lib.fisipumt.ac.id/repository/free-unused-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/robux-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/free-spins-coin-master-apple_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/free-spin-links-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/roblox-free-for-pc-download_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/coin-master-daily-spin-free_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/how-do-you-get-roebucks-for-free_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/roblox-full-game-free-download_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/free-robux-codes-2021-not-used_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/broken-bones-5-roblox-hack_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/inappropriate-roblox-games_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/how-to-get-free-robux-in-2021_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/minecraft-name-tag-hacks_GM479516143.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/rbx-com_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/hack-coin-master-2021-pc_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/pubg-uc-zing_GM1330123889.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/fast-robux-online_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/muscle-simulater-roblox-cheat-codes_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/robux-gift-card-free_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/pokemon-go-free-joystick-android_GM1094591345.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_off00002f7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F7B 22724 bytes
SHA-256: fc288e51578a7a098843d2cca1d3522997e9cec5e2fc0674363635356aaca7ee
font_01_sfnt_off00006204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6204 19180 bytes
SHA-256: 05d373e4951e46827a55650d1ef3efd2d0e2ae02acc172c0a0b541a76eb83b85

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