Malicious PDF — malware analysis report

Static analysis result for SHA-256 28973b29c928f68b…

MALICIOUS

PDF

34.5 KB Created: 2021-06-25 13:05:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: fde531df4ba2177b77cc07821d8fff07 SHA-1: acf0df434d97fbefcb8ab8ac1353d297869d2495 SHA-256: 28973b29c928f68b0c4358c9b75602fa0f3036dfb0575f398d5ba684ec168fca
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document is designed as a lure, using keywords related to game hacks and free items to attract users. It contains numerous links, including a primary malicious redirector at http://netcdn.co/app/431946152/how-to-fix-elysian-roblox-hack-crash-game-hack, which likely leads to further malicious content or downloads. The document's structure and embedded links suggest an attempt to drive traffic to SEO link farms and potentially exploit users seeking cheats or in-game currency.

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-to-fix-elysian-roblox-hack-crash-game-hack In PDF document text
    • http://library.stembi.ac.id/repository/free-item-in-catalog-roblox_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/roblox-hack-atravesar-paredes-actualizado-2021-funcionando_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/free-robux-for-sale_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/roblox-best-hack-for-jailbreak-2021_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/how-to-get-free-cars-in-jailbreak-roblox_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/free-robux-easily-low-age-rating_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/will-they-cheat-roblox-thumbnail_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/roblox-crc7-hack-admin-code_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/dragon-ball-advanced-battle-roblox-hack_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/roblox-in-edit-game-hack-gui_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/how-to-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/caesar-emergency-department-hack-roblox_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/free-robux-working_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/how-to-get-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/how-to-get-stuff-for-free-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/cheat-roblox-menu-download_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/descargar-hack-para-roblox-pc_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/can-you-get-cuaght-for-hacking-in-roblox_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/roblox-zone-free-robux_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_off0000312b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x312B 21704 bytes
SHA-256: ec9e868f3600226607dab3b7a1c83321d7b141163525129342f6ce07056cb88a
font_01_sfnt_off000060ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60ED 19448 bytes
SHA-256: 575465e56814a48468b2f8d0cf47269102a1ea3a95ddf12c0beb3df0375c06db

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