Malicious PDF — malware analysis report

Static analysis result for SHA-256 5333c28104d2b9c4…

MALICIOUS

PDF

35.3 KB Created: 2021-07-03 21:45:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 5983a9723aa28c6e9d7bbcd0d2ae259e SHA-1: e45343b741c891bc6926a841a3fc308eeb504fd8 SHA-256: 5333c28104d2b9c4c4cc5470cbea5d0cd0a431c3f4c5d327ba5ace2936878502
142 Risk Score

Malware Insights

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

The PDF document employs a lure of game hacks and free in-game items to entice users. It contains a large number of external links, many of which point to other PDFs hosted on reach360stock.com, suggesting a link farm designed to drive traffic to malicious or scam-related content. The ML classifier also strongly indicated maliciousness.

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/how-to-get-hacks-on-roblox-game-hack PDF link annotation
    • http://www.reach360stock.com/uploaded_files/userfiles/files/coin-master-twitter_GM406889139.pdfIn PDF document text
    • http://www.reach360stock.com/uploaded_files/userfiles/files/how-to-get-rainbow-wings-in-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://www.reach360stock.com/uploaded_files/userfiles/files/how-to-get-zombie-animation-for-free-roblox_GM431946152.pdfIn PDF document text
    • http://www.reach360stock.com/uploaded_files/userfiles/files/make-free-shirts-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.reach360stock.com/uploaded_files/userfiles/files/ac-market-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://www.reach360stock.com/uploaded_files/userfiles/files/free-coin-and-spin-in-coin-master_GM406889139.pdfIn PDF document text
    • http://www.reach360stock.com/uploaded_files/userfiles/files/rbx-place-free-robux_GM431946152.pdfIn PDF document text
    • http://www.reach360stock.com/uploaded_files/userfiles/files/i-didnt-get-my-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://www.reach360stock.com/uploaded_files/userfiles/files/free-robux-apps-that-work_GM431946152.pdfIn PDF document text
    • http://www.reach360stock.com/uploaded_files/userfiles/files/how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.reach360stock.com/uploaded_files/userfiles/files/coin-master-34-4-hack_GM406889139.pdfIn PDF document text
    • http://www.reach360stock.com/uploaded_files/userfiles/files/free-robux-com-2021_GM431946152.pdfIn PDF document text
    • http://www.reach360stock.com/uploaded_files/userfiles/files/free-military-shirt-templates-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.reach360stock.com/uploaded_files/userfiles/files/roblox-how-to-speed-hack-with-cheat-engine-64_GM431946152.pdfIn PDF document text
    • http://www.reach360stock.com/uploaded_files/userfiles/files/free-me-robux_GM431946152.pdfIn PDF document text
    • http://www.reach360stock.com/uploaded_files/userfiles/files/blox-supply-free-robux_GM431946152.pdfIn PDF document text
    • http://www.reach360stock.com/uploaded_files/userfiles/files/coin-master-free-spins-apple_GM406889139.pdfIn PDF document text
    • http://www.reach360stock.com/uploaded_files/userfiles/files/free-robux-hack-generator-without-human-verification_GM431946152.pdfIn PDF document text
    • http://www.reach360stock.com/uploaded_files/userfiles/files/coin-master-gold-cards-hack_GM406889139.pdfIn PDF document text
    • http://www.reach360stock.com/uploaded_files/userfiles/files/roblox-phantom-forces-hacks-very-op-free-weapon-hack_GM431946152.pdfIn PDF document text
    • https://www.semrush.com/prices/In 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_off00003190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3190 22840 bytes
SHA-256: f2d0493f5f7d018f212ca9c6f5ab3669e53c78b4a229499c271254b7802f93b2
font_01_sfnt_off00006502.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6502 18924 bytes
SHA-256: 8cdc80fef149013af70ce1ea380cb26237808cf67cdf225847d5804ac9d16e08

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