Malicious PDF — malware analysis report

Static analysis result for SHA-256 c284eedcc770cb38…

MALICIOUS

PDF

34.6 KB Created: 2021-07-06 14:24:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 24da13d9328a400d8b1237d07da61724 SHA-1: ed6299821b47a82018a0a3e4995062384071cee8 SHA-256: c284eedcc770cb38d8ad42918f2ef5ea787a5d449ba1571a7239f73ad6b715bc
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/406889139/coin-master-hack-spin-ios-game-hack PDF link annotation
    • http://sttlets.education/senayan//repository/hack-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/coin-master-free-spins-and-coins-today_GM406889139.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/coin-master-free-spin-and-coin-links_GM406889139.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/cheat-codes-for-bank-tycoon-roblox_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/hectic-plays-free-robux_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/robux-hack-no-download-or-survey_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/roblox-free-download_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/roblox-gift-card-for-free_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/infinite-health-hack-roblox_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/how-to-get-free-robux-from-inspecting-2021_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan//repository/how-to-actually-get-free-robux_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/wurst_GM479516143.pdfIn PDF document text
    • http://sttlets.education/senayan//repository/free-roblox-hack_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/como-ser-un-hacker-en-house-of-keys-roblox_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/free-roblox-accessories_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/best-free-level-7-executor-free-for-roblox-2021-august_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/minecraft-ps4-free_GM479516143.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/how-to-get-a-free-roblox-card-code_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/how-to-get-free-robux-2021-mac_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/roblox-why-does-hacking-kick-you-from-server_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_off00003126.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3126 22984 bytes
SHA-256: 735cfec3debc44a53003850f15b5977ea2ebd57f043f351225fcddd36301f8d9
font_01_sfnt_off000064c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64C8 18180 bytes
SHA-256: 8d127c5bb32b619c47a60760147d13e4fdf9b6a0d766bd40fdbe03810a814be5

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