Malicious PDF — malware analysis report

Static analysis result for SHA-256 49a0643e6552da2e…

MALICIOUS

PDF

35.9 KB Created: 2021-06-29 10:11:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 0c2dcba2a9f96148571256ade73e1db3 SHA-1: a99770c7301bf645aa4cedbc86ba0b56024161aa SHA-256: 49a0643e6552da2e8ab9bc77625f17a699823d958b301749d2ecfb61f3ea38d3
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are SEO-optimized to appear as game-related content like 'free robux' or 'game hacks'. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of such links, suggesting a link farm or SEO manipulation tactic. The primary URL, http://netcdn.co/app/431946152/how-to-recover-hacked-roblox-account-without-email-game-hack, is presented as a lure for game account recovery, likely to redirect users to malicious sites or advertisements. No scripts were extracted, but the document's structure and content strongly suggest a phishing or SEO spam campaign.

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-recover-hacked-roblox-account-without-email-game-hack PDF link annotation
    • https://pustaka.widyakartika.ac.id/repository/roblox-free-adidas-pants_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/how-to-get-free-robux-in-jailbreak_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/promo-codes-for-free-stuff-2021-roblox_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/how-to-get-free-cloathes-in-roblox_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/free-robux-youtubbe_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/free-robux-hack-download-free_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/300-daily-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/coin-master-game-free-spin_GM406889139.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/coin-master-hack-game-download_GM406889139.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/coin-master-free-spin-app-apk_GM406889139.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/counter-blox-roblox-offensive-hacks-2021-free-download_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/spin-free-coin-master_GM406889139.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/how-to-hack-roblox-games-2021_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/free-roblox-obby_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/coin-master-hack-spins-download_GM406889139.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/easy-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/hack-coin-master-link_GM406889139.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/40-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/free-coin-coin-master_GM406889139.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/comment-hacker-dans-roblox-pc_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_off00003221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3221 22416 bytes
SHA-256: 3c3c32a322bc000ed56decd36894dbbfa40b77d85947161abedea98d7704527e
font_01_sfnt_off00006421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6421 20096 bytes
SHA-256: 759380cfb3df04ca991ae186361c9441e4b07ffc64787204b9caf8444e221ac8

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