Malicious PDF — malware analysis report

Static analysis result for SHA-256 38b119efab1b4791…

MALICIOUS

PDF

36.5 KB Created: 2021-06-20 08:49:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-04
MD5: fea20df5ba6c5e0aeaf30f4319c3afeb SHA-1: c5a1b3919f88d4126b436e44e6cf055063812904 SHA-256: 38b119efab1b47914d3030094de96cbc65b1dd35ad8221ef8476e11b959b4882
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/nonseindiamond-hack-roblox-game-hack PDF link annotation
    • http://digilib-ppsunisma.ac.id/repository/tiktok-free-views_GM835599320.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/free-robux-app_GM431946152.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/how-to-get-minecraft-for-free-ios_GM479516143.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/roblox-speed-hack-2021-booga-booga_GM431946152.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/how-to-hack-roblox-for-robux_GM431946152.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/free-robux-card-codes-2021_GM431946152.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/mcpe-master-hack-coin-apk_GM406889139.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/coin-master-hack-cheat-engine_GM406889139.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/free-roblox-premium-generator_GM431946152.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/free-roblox-robux-generator-2021-without-human-verify_GM431946152.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/doj-paleto-bay-roblox-hacks_GM431946152.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/free-roblox-clothes-for-your-avatar_GM431946152.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/is-minecraft-free-on-ps4_GM479516143.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/how-to-get-hacks-on-roblox_GM431946152.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/how-to-get-minecraft-for-free-on-xbox-one_GM479516143.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/how-to-get-free-bugatti-in-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/free-robux-codes-for-pc_GM431946152.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/free-robux-generator-no-survey-no-download-no-human-verification_GM431946152.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/how-to-hack-roblox-for-admin-commands_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_off000034af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x34AF 23192 bytes
SHA-256: 1e3867aff0190c3be56b758085fd7cd19c01e07f56655bd98a2bf336ab7d706c
font_01_sfnt_off00006928.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6928 19208 bytes
SHA-256: b75b83858712a6b65e773f441c8a013087f685005fae9be09ef67ef10494dac1

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