Malicious PDF — malware analysis report

Static analysis result for SHA-256 3976f576ec2adc1b…

MALICIOUS

PDF

34.8 KB Created: 2021-06-20 01:28:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: f048c6d5b6455f1b1746c751a15e9327 SHA-1: 1a0e14e4259bb4d9a28ef4cc4c15d4f71749e10f SHA-256: 3976f576ec2adc1b7bb87fe089d5f2f02d11c6904cf15ea82cf527529a3271f1
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document employs a common lure of 'free Robux' and 'game hacks' to entice users. It contains numerous external links, including one to 'netcdn.co', which likely serves as a redirector to malicious sites. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of generated links, suggesting a spam or SEO poisoning campaign. While no scripts were explicitly extracted, the nature of the content and the embedded links strongly suggest a phishing or malware distribution attempt, likely initiated via spearphishing.

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/how-to-get-free-robux-without-hacking-on-ipad-game-hack PDF link annotation
    • http://perpus.unbi.ac.id/slims7_cendana/repository/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://perpus.unbi.ac.id/slims7_cendana//repository/coin-master-unlimited-free-spins_GM406889139.pdfIn PDF document text
    • http://perpus.unbi.ac.id/slims7_cendana/repository/free-robux-no-gift-card_GM431946152.pdfIn PDF document text
    • http://perpus.unbi.ac.id/slims7_cendana//repository/can-you-really-hack-coin-master-ios_GM406889139.pdfIn PDF document text
    • http://perpus.unbi.ac.id/slims7_cendana/repository/free-robux-no-survey-no-verification-no-download_GM431946152.pdfIn PDF document text
    • http://perpus.unbi.ac.id/slims7_cendana/repository/minecraft-xbox-one-code-free_GM479516143.pdfIn PDF document text
    • http://perpus.unbi.ac.id/slims7_cendana//repository/how-to-get-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.unbi.ac.id/slims7_cendana//repository/free-daily-spin-coin-master-game_GM406889139.pdfIn PDF document text
    • http://perpus.unbi.ac.id/slims7_cendana/repository/coin-master-apk_GM406889139.pdfIn PDF document text
    • http://perpus.unbi.ac.id/slims7_cendana//repository/how-to-get-free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://perpus.unbi.ac.id/slims7_cendana//repository/free-coin-master-glitches_GM406889139.pdfIn PDF document text
    • http://perpus.unbi.ac.id/slims7_cendana/repository/generator-robux_GM431946152.pdfIn PDF document text
    • http://perpus.unbi.ac.id/slims7_cendana//repository/hacks-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.unbi.ac.id/slims7_cendana/repository/minecraft-bedrock-for-free_GM479516143.pdfIn PDF document text
    • http://perpus.unbi.ac.id/slims7_cendana/repository/coin-master-daily-free-spins-link-today-2021_GM406889139.pdfIn PDF document text
    • http://perpus.unbi.ac.id/slims7_cendana//repository/roblox-download-pc-free_GM431946152.pdfIn PDF document text
    • http://perpus.unbi.ac.id/slims7_cendana//repository/free-cracked-minecraft-server-hosting_GM479516143.pdfIn PDF document text
    • http://perpus.unbi.ac.id/slims7_cendana/repository/coin-master-hack-tool-v1-9-download-free_GM406889139.pdfIn PDF document text
    • http://perpus.unbi.ac.id/slims7_cendana/repository/coin-master-link_GM406889139.pdfIn PDF document text
    • http://perpus.unbi.ac.id/slims7_cendana//repository/coin-master-free-spins-and-free-coins_GM406889139.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_off00002f70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F70 21956 bytes
SHA-256: e5ab6f507d9028ae394142904df3cea512ced828fba99b4b06a5cd25bda621c6
font_01_sfnt_off0000600b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x600B 19988 bytes
SHA-256: c1c35da0ac8abd65a84830b3ddea621b3a115aaeb06b4b0aaa647eb1d06417d0

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