Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccb32fa00078cf59…

MALICIOUS

PDF

36.2 KB Created: 2021-07-04 18:23:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 4aaeca8a986354a173fa2b00b2bc8f9f SHA-1: 491cdad263db4b3bcbadd2f7366b516ed671dc00 SHA-256: ccb32fa00078cf59e0cc7ee93008589a9316bfcdea0d6f946df2cc4d76ae2610
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links and a lure for "free Robux" and "game hacks", indicating a phishing or scam attempt. The ML classifier strongly flagged this PDF as malicious. The embedded links likely redirect to sites designed to exploit users or deliver further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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.tw/app/431946152/free-robux-2021-no-human-verification-game-hack PDF link annotation
    • https://perpustakaan.stami.ac.id//repository/free-robux-games-that-actually-work_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/free-coin-master-gifts_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/what-games-on-roblox-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/coin-master-free-spin-daily-bonus_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/coin-master-daily-free-spins_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/legit-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/how-to-get-pokecoins-pokemon-go-free_GM1094591345.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/free-printable-roblox-images_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/minecraft-free-computer-game_GM479516143.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/free-roblox-executor_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/coin-master-32-hack-apk-download_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/how-to-hack-coin-master_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/coin-master-free-spins-link-today_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/roblox-website-robux_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/roblox-online-free_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/coin-master-daily-free-spins-link-download_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/coin-master-32-mod-hack-apk-download_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/free-roblox-hair-boy_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/coin-master-tiradas-gratis-link_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/free-coin-master-spins-2021_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_off00003408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3408 22612 bytes
SHA-256: 7cd5b59caecb748a0f0c7ccf88958030376c8bd5c6f718f6e66f241186802baa
font_01_sfnt_off00006673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6673 19736 bytes
SHA-256: 415a8643b263bdb8a5e4ae51f1e0119ae52f9187a77a7c28158d674e6dc65c25

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