Malicious PDF — malware analysis report

Static analysis result for SHA-256 c913a5f7474b2eb7…

MALICIOUS

PDF

34.3 KB Created: 2021-07-03 11:14:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 48aa5f06f30d4cd641f619537c70b0be SHA-1: 7cd4fd4fcf67650e9c2d908e5272e02b53190ea6 SHA-256: c913a5f7474b2eb77770a59c6ceec188a4a0730ca449ea2874526649931a52dc
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous links to external websites, many of which are hosted on domains associated with link farms and SEO manipulation. The primary lure appears to be 'game hacks' for popular mobile games like Coin Master and Roblox. The document's structure and the presence of multiple SEO-optimized PDF links suggest an attempt to drive traffic to potentially malicious sites, likely for phishing or distributing further malware. No scripts were extracted, but the PDF's content and structure strongly indicate a malicious intent to deceive users into clicking these links.

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/406889139/coin-master-cards-hack-game-hack PDF link annotation
    • http://www.library.umbjm.ac.id/repository/coin-master-free-spins-2021-ios_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/how-to-hack-roblox-accounts-2021-easy_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-pro-hack_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/master-coin-hack-game_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-game-pack-with-google-play-coin-master_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/programa-para-hackear-usuuarios-de-roblox_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/tiktok-free-download-for-iphone_GM835599320.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-free-food-for-pet_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/swiftbucks-hack-roblox_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/best-free-to-play-tower-defense-games-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/how-to-spawn-stuff-in-roblox-using-cheat-engine_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-free-spins-link-2021-hack_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/easy-robux_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-coins-2021-coin-master-link_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/get-free-robux-now_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/minecraft-free-trial_GM479516143.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/roblox-gift-card-online-free_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/minecraft-survival-free_GM479516143.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/daily-free-spins-coin-master-app_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-hack-apk_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00002fad.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2FAD 23200 bytes
SHA-256: 72094f037a759b7266b536e0ee6574b5f7e683555b086abf5bdf0214bf3714d5
font_01_sfnt_off000063c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63C5 18180 bytes
SHA-256: 6f4994608566ebd9397f6cc175ec3337bd2a095019109335e6b17d055b146122

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