Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3eab028c701fcf8…

MALICIOUS

PDF

33.6 KB Created: 2021-07-05 02:12:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 2182b263e77f2877f86ca8b6772ab1f4 SHA-1: 0dd8a6e3d933fdf12d26790d2f9de388541367e8 SHA-256: c3eab028c701fcf8c7dd9d5b5d2c7c0c2c087a40d0c184f839221de366171b78
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains numerous links to external websites, many of which are hosted on a link farm domain and masquerade as generators or hacks for popular games like Roblox and Coin Master. The ML classifier strongly indicated maliciousness, and the presence of a 'free generator' lure suggests a phishing or malware distribution attempt. No scripts were extracted, but the PDF structure and embedded links are indicative of a social engineering attack.

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.tw/app/431946152/free-robux-net-game-hack PDF link annotation
    • http://perpustakaan.iaiqi.ac.id/repository/free-coins-and-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://perpustakaan.iaiqi.ac.id/repository/hack-coin-master-android_GM406889139.pdfIn PDF document text
    • http://perpustakaan.iaiqi.ac.id/repository/get-free-stuff-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://perpustakaan.iaiqi.ac.id/repository/roblox-hack-tool-2021-download_GM431946152.pdfIn PDF document text
    • http://perpustakaan.iaiqi.ac.id/repository/free-robux-giver_GM431946152.pdfIn PDF document text
    • http://perpustakaan.iaiqi.ac.id/repository/coin-master-free-spins-link-blogspot_GM406889139.pdfIn PDF document text
    • http://perpustakaan.iaiqi.ac.id/repository/comment-cheater-sur-roblox-franais-sur-jailbreak-levels-airdrops_GM431946152.pdfIn PDF document text
    • http://perpustakaan.iaiqi.ac.id/repository/free-spins-and-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://perpustakaan.iaiqi.ac.id/repository/roblox-tricks-cheats_GM431946152.pdfIn PDF document text
    • http://perpustakaan.iaiqi.ac.id/repository/how-do-you-get-free-robux-gift-cards_GM431946152.pdfIn PDF document text
    • http://perpustakaan.iaiqi.ac.id/repository/feb-23-2021-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://perpustakaan.iaiqi.ac.id/repository/roblox-sword-fighting-tournament-points-hack-2021_GM431946152.pdfIn PDF document text
    • http://perpustakaan.iaiqi.ac.id/repository/free-roblox-thank-you-tags_GM431946152.pdfIn PDF document text
    • http://perpustakaan.iaiqi.ac.id/repository/how-can-i-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://perpustakaan.iaiqi.ac.id/repository/pubg-uc-top-up_GM1330123889.pdfIn PDF document text
    • http://perpustakaan.iaiqi.ac.id/repository/free-roblox-gift-card-codes-2021-not-used_GM431946152.pdfIn PDF document text
    • http://perpustakaan.iaiqi.ac.id/repository/free-running-gamepass-parkour-roblox_GM431946152.pdfIn PDF document text
    • http://perpustakaan.iaiqi.ac.id/repository/free-minecraft-hosting_GM479516143.pdfIn PDF document text
    • http://perpustakaan.iaiqi.ac.id/repository/monster-slaying-simulator-cheats-roblox_GM431946152.pdfIn PDF document text
    • http://perpustakaan.iaiqi.ac.id/repository/cheats-for-egg-farm-simulator-roblox_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_off00002f01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F01 21760 bytes
SHA-256: 425b7a4dc721f61cdfaf3411539256939b420b8f6560f514f30201be70548310
font_01_sfnt_off00005eed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5EED 18820 bytes
SHA-256: ca85981c18dc15ba0057413255a9444b5a0283357368fb65870b2d832d7eb440

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