Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e60eb05583854af…

MALICIOUS

PDF

34.7 KB Created: 2021-07-03 17:17:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 9d2942b23305ebcce1acc6c68313004a SHA-1: 1b2b5db57c59b84aaadcd722b2b67b021328e6b6 SHA-256: 7e60eb05583854af07a058b59e58869e6abc6e0e46ff31c2252943627d848eb9
142 Risk Score

Malware Insights

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

The PDF document contains numerous links, including one to 'netcdn.tw', which is identified as a redirector for game hacks and free currency. This indicates a lure to potentially malicious websites, likely for credential harvesting or malware distribution. The ML classifier also flagged this PDF as malicious with high confidence.

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/free-money-and-spins-coin-master-game-hack PDF link annotation
    • https://www.e-starmagazine.com/uploads/files/how-to-become-a-hacker-in-roblox_GM431946152.pdfIn PDF document text
    • https://www.e-starmagazine.com/uploads/files/coin-master-email-free-spins_GM406889139.pdfIn PDF document text
    • https://www.e-starmagazine.com/uploads/files/free-robux-not-fake_GM431946152.pdfIn PDF document text
    • https://www.e-starmagazine.com/uploads/files/youtube-how-to-hack-acounts-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.e-starmagazine.com/uploads/files/hack-my-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.e-starmagazine.com/uploads/files/how-to-get-free-gold-cards-on-coin-master_GM406889139.pdfIn PDF document text
    • https://www.e-starmagazine.com/uploads/files/roblox-heroes-online-free_GM431946152.pdfIn PDF document text
    • https://www.e-starmagazine.com/uploads/files/good-watchdogs-hacking-games-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.e-starmagazine.com/uploads/files/minecraft-dungeons-free-download-pc_GM479516143.pdfIn PDF document text
    • https://www.e-starmagazine.com/uploads/files/free-robux-pin-codes_GM431946152.pdfIn PDF document text
    • https://www.e-starmagazine.com/uploads/files/roblox-crashes-when-i-open-cheat-engine_GM431946152.pdfIn PDF document text
    • https://www.e-starmagazine.com/uploads/files/free-robux-easy_GM431946152.pdfIn PDF document text
    • https://www.e-starmagazine.com/uploads/files/promo-code-free-robux_GM431946152.pdfIn PDF document text
    • https://www.e-starmagazine.com/uploads/files/free-roblox-account-with-robux-password_GM431946152.pdfIn PDF document text
    • https://www.e-starmagazine.com/uploads/files/hacks-roblox_GM431946152.pdfIn PDF document text
    • https://www.e-starmagazine.com/uploads/files/games-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.e-starmagazine.com/uploads/files/download-pokemon-go-free_GM1094591345.pdfIn PDF document text
    • https://www.e-starmagazine.com/uploads/files/is-minecraft-free-on-xbox-one_GM479516143.pdfIn PDF document text
    • https://www.e-starmagazine.com/uploads/files/what-games-on-roblox-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://www.e-starmagazine.com/uploads/files/server-destroy-exploit-roblox-cheat-engine_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
stream_002_off0000303c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x303C 23048 bytes
SHA-256: 494a52ce85bc12e8327b2295682e624c24803945bcdf03ec056ce1c925ca3ce3
font_01_sfnt_off00006421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6421 18528 bytes
SHA-256: a3b86bd073d608b5a4f4f0ad2dbabdcfa65464da967c1c6f98e46308f766436f

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