Malicious PDF — malware analysis report

Static analysis result for SHA-256 d81075d4f4be1000…

MALICIOUS

PDF

34.4 KB Created: 2021-06-19 19:54:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-04
MD5: fcb835e5ee26074f1978170110683c37 SHA-1: 1a20159d2ae00d621b0e24c1be83220a631193fc SHA-256: d81075d4f4be1000b3dca420090194f4bad67cf787b7fbedf1035de87f324981
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 0.9980

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 http://netcdn.co/app/431946152/free-computer-robux-game-hack PDF link annotation
    • http://jarviskeller.co.uk/media/storage/editor/files/free-robux-no-verification-needed_GM431946152.pdfIn PDF document text
    • http://jarviskeller.co.uk/media/storage/editor/files/free-robux-sites-2021_GM431946152.pdfIn PDF document text
    • http://jarviskeller.co.uk/media/storage/editor/files/best-free-survival-games-on-roblox_GM431946152.pdfIn PDF document text
    • http://jarviskeller.co.uk/media/storage/editor/files/free-robux-app-real_GM431946152.pdfIn PDF document text
    • http://jarviskeller.co.uk/media/storage/editor/files/try-minecraft-free_GM479516143.pdfIn PDF document text
    • http://jarviskeller.co.uk/media/storage/editor/files/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://jarviskeller.co.uk/media/storage/editor/files/free-robux-code-genrator_GM431946152.pdfIn PDF document text
    • http://jarviskeller.co.uk/media/storage/editor/files/how-to-get-free-robux-without-verifying_GM431946152.pdfIn PDF document text
    • http://jarviskeller.co.uk/media/storage/editor/files/free-robux-only-username_GM431946152.pdfIn PDF document text
    • http://jarviskeller.co.uk/media/storage/editor/files/gold-card-coin-master-free_GM406889139.pdfIn PDF document text
    • http://jarviskeller.co.uk/media/storage/editor/files/how-to-get-free-robux-working-2021-phone-easy_GM431946152.pdfIn PDF document text
    • http://jarviskeller.co.uk/media/storage/editor/files/minecraft-mods-download-free_GM479516143.pdfIn PDF document text
    • http://jarviskeller.co.uk/media/storage/editor/files/google-how-do-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://jarviskeller.co.uk/media/storage/editor/files/get-me-robux-for-free_GM431946152.pdfIn PDF document text
    • http://jarviskeller.co.uk/media/storage/editor/files/coin-master-free-spins--coins-2021_GM406889139.pdfIn PDF document text
    • http://jarviskeller.co.uk/media/storage/editor/files/minecraft-java-edition-for-free_GM479516143.pdfIn PDF document text
    • http://jarviskeller.co.uk/media/storage/editor/files/free-mods-for-minecraft-pe_GM479516143.pdfIn PDF document text
    • http://jarviskeller.co.uk/media/storage/editor/files/best-free-minecraft-server-hosting_GM479516143.pdfIn PDF document text
    • http://jarviskeller.co.uk/media/storage/editor/files/free-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://jarviskeller.co.uk/media/storage/editor/files/how-to-get-free-robux-2021-no-human-verification_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_off0000302f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x302F 22044 bytes
SHA-256: a8e23849a9d43565320afaf8629ff5b81186176f80991302b6fe0fea75a40f93
font_01_sfnt_off000060e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60E9 19256 bytes
SHA-256: b5d29cb47af33751db073669791f4bb2046c83b32ccc3c70a03b81637872ceca

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