Malicious PDF — malware analysis report

Static analysis result for SHA-256 e02816d4596715cc…

MALICIOUS

PDF

36.2 KB Created: 2021-07-08 21:46:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 02046ad9aa0c400ba65953498c864742 SHA-1: 3a2515ff040c13f3a7e41ff62a9b832bc2206722 SHA-256: e02816d4596715cc119cc43e6febce8a760122462644cba89ce1720d21e7fd2c
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

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/oprewards-com-robux-game-hack PDF link annotation
    • https://www.toyogas.com.tw/upload/files/blogspot-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://www.toyogas.com.tw/upload/files/roblox-cbro-how-to-get-free-knife_GM431946152.pdfIn PDF document text
    • https://www.toyogas.com.tw/upload/files/coin-master-date-and-time-hack_GM406889139.pdfIn PDF document text
    • https://www.toyogas.com.tw/upload/files/free-robux-net_GM431946152.pdfIn PDF document text
    • https://www.toyogas.com.tw/upload/files/free-robux-real-2021_GM431946152.pdfIn PDF document text
    • https://www.toyogas.com.tw/upload/files/how-to-get-infinite-robux_GM431946152.pdfIn PDF document text
    • https://www.toyogas.com.tw/upload/files/fort-hood-texas-hacks-roblox_GM431946152.pdfIn PDF document text
    • https://www.toyogas.com.tw/upload/files/how-to-hack-to-get-robux_GM431946152.pdfIn PDF document text
    • https://www.toyogas.com.tw/upload/files/best-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.toyogas.com.tw/upload/files/you-promised-my-son-free-robux_GM431946152.pdfIn PDF document text
    • https://www.toyogas.com.tw/upload/files/promo-codes-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.toyogas.com.tw/upload/files/bloxland-earn-free-robux_GM431946152.pdfIn PDF document text
    • https://www.toyogas.com.tw/upload/files/free-followers-for-tiktok_GM835599320.pdfIn PDF document text
    • https://www.toyogas.com.tw/upload/files/free-robux-no-verification-needed_GM431946152.pdfIn PDF document text
    • https://www.toyogas.com.tw/upload/files/how-to-get-free-robux-without-downloading-anything_GM431946152.pdfIn PDF document text
    • https://www.toyogas.com.tw/upload/files/little-kid-caught-cheating-on-his-roblox-girlfriends_GM431946152.pdfIn PDF document text
    • https://www.toyogas.com.tw/upload/files/coin-master-get-free-spins_GM406889139.pdfIn PDF document text
    • https://www.toyogas.com.tw/upload/files/how-to-get-anything-free-on-roblox-ios_GM431946152.pdfIn PDF document text
    • https://www.toyogas.com.tw/upload/files/download-roblox-for-free-unlockable_GM431946152.pdfIn PDF document text
    • https://www.toyogas.com.tw/upload/files/noob-vs-pro-vs-hacker-vs-god-roblox-jailbreak_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_off000033f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x33F0 23024 bytes
SHA-256: 6a4beefc1c8ef3fd5e5e2a65d0a7827f3b83564008d73c15f6be5ab3db10ad23
font_01_sfnt_off00006793.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6793 19324 bytes
SHA-256: 35589dba4e7bbe14e1ea02444a76fb8b1cb592c0f5e8a7b1a407e52a29e90510

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