Malicious PDF — malware analysis report

Static analysis result for SHA-256 5aa50b86ebe9d2dd…

MALICIOUS

PDF

52.6 KB Created: 2021-06-04 03:40:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 29fa2054755d51bdfc9ba4a656458956 SHA-1: b446b0c2a17e568af55f1d250b6590875a6657e4 SHA-256: 5aa50b86ebe9d2dd731f3574c7719da9e17e08e24d19281fc657344116a20b85
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9614

Heuristics 5

  • 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.
  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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 https://netcdn.online/app/431946152/invisible-hack-roblox-2021-game-hack PDF link annotation
    • http://perpus.stmik-im.ac.id/repository/minecraft-pocket-edition-mods-for-free_GM479516143.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/como-hackear-coin-master-en-espaol_GM406889139.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/roblox-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/how-to-change-your-username-on-roblox-for-free-2021_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/coin-master-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/how-to-hack-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/coin-master-free-pet-snacks_GM406889139.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/coin-master-apk-hack-35-8_GM406889139.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/roblox-hack-app_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/roblox-group-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/free-robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/how-to-get-minecraft-coins-for-free_GM479516143.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/how-to-hack-coin-master-spin-in-hindi_GM406889139.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/free-coin-master-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/roblox-avatar-free_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/how-to-get-free-robux-fast-and-easy_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/coin-master-free-spin-link-list_GM406889139.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/can-you-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/how-to-download-minecraft-for-free-on-windows-10_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005271.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5271 25664 bytes
SHA-256: e9621f7f1845b4c4a6944b17c176511c796e3a4327d250447df96e2a39e91c2e
font_01_sfnt_off00008d16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D16 8704 bytes
SHA-256: 39621d468ee1ea45cfd77c2a5e31c688636f452f9f0cc0d9213932d691ddc971
font_02_sfnt_off0000a982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA982 18816 bytes
SHA-256: e08e530344d74e0fb37ccef19dbe8b6ac72bd4afabd5dcbf993a4a9156b8bfc0

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