Malicious PDF — malware analysis report

Static analysis result for SHA-256 40df58b8ad1084e9…

MALICIOUS

PDF

37.6 KB Created: 2021-06-20 08:16:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 662daf34db2b2e83801b23d6d3a31fb2 SHA-1: 0e3e25801e8357c048db5c1280c3cff8e8d38f65 SHA-256: 40df58b8ad1084e95414f4cf881124727782704b5a7ffb38bcc37e5853028e4e
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-level-7-hack-roblox-game-hack PDF link annotation
    • https://pasca.unisba.ac.id/elibrary/repository/robux-has-hit-10million-users-free-robux_GM431946152.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/how-you-get-free-robux_GM431946152.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/lazyblox-com-free-robux_GM431946152.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/dominus-rex-for-free-roblox-extreme-hacks_GM431946152.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/daily-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/free-robux-generator-com-roblox-hack_GM431946152.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/free-robux-no-verification-at-all_GM431946152.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/free-coin-master-game_GM406889139.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/try-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/links-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/roblox-free-shirts-and-pants-2021_GM431946152.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/rthe-wild-west-roblox-when-is-going-to-be-free_GM431946152.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/free-play-online-roblox_GM431946152.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/game-cheat-central-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/free-robux-no-verification-or-survey_GM431946152.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/how-to-hack-a-minecraft-account_GM479516143.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/free-coin-master-spin-daily-link_GM406889139.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/finally-roblox-free-gifts_GM431946152.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/free-robux-no-verification-2021-android_GM431946152.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/free-spin-sites-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.roblox.com/.IIn 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_off00003b5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3B5E 22732 bytes
SHA-256: f035c6f3d5c79faf98ec6d02f34c184df2300bde7017365d1e045b6599532c4b
font_01_sfnt_off00006e24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E24 18988 bytes
SHA-256: cd8bfc458bed178025c0c604433cc8a194fae6ce6a234da8e025b8122276dc80

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