Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f44d26c66d99eef…

MALICIOUS

PDF

44.4 KB Created: 2021-06-03 08:23:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 49948d900cbbeb4666e1f17bc59314ab SHA-1: 1cd84200de9c9d5f7d81ac30e76f485dba230170 SHA-256: 8f44d26c66d99eefea86df9fdf16ee6deed5fc3e1ba59654511052848839d26a
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 0.9865

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/479516143/minecraft-xbox-one-code-free-game-hack PDF link annotation
    • http://library-fkip.uho.ac.id/repository/no-scam-free-robux_GM431946152.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/how-to-get-minecraft-for-free-ios_GM479516143.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/how-to-get-free-robux-gift-cards_GM431946152.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/coin-master-free-coins-and-spins-app_GM406889139.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/coin-master-free-spin-codes_GM406889139.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/today-free-spin-coin-master_GM406889139.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/free-robux-no-survey_GM431946152.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/minecraft-for-laptop-free_GM479516143.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/free-robux-generator-no-human-verification-or-surveys_GM431946152.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/free-spin-links-coin-master-october-30-2021_GM406889139.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/free-spin-today-coin-master_GM406889139.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/coin-master-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/how-to-get-free-robux-for-kids_GM431946152.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/free-coin-master-spin-app_GM406889139.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/coin-master-hack-mod-apk-unlimited-spin-download_GM406889139.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/coin-master-daily-free-spins-link_GM406889139.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/roblox-hack-com_GM431946152.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/how-to-hack-to-get-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
stream_004_off00005396.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5396 24108 bytes
SHA-256: a0a48a6dd6a00fe50d712140866dc0e343c4872cd7076cca643998786b85c990
font_01_sfnt_off00008a83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A83 18480 bytes
SHA-256: 32547446bdc1c02af64d5cec1ea24df84aad3939df267a2968463dfca93ea3eb

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