Malicious PDF — malware analysis report

Static analysis result for SHA-256 c001cbc82fe99545…

MALICIOUS

PDF

48.0 KB Created: 2021-06-08 09:47:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: f3146acd20ffb596a2d48c547ad96a0a SHA-1: 0977618133511d28c1df1add32c03abff03ed30f SHA-256: c001cbc82fe99545ccb8a9260682406b725d6712551fb8e0a6ed7cba2e847d96
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 0.9796

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 https://netcdn.tw/app/431946152/free-shavaka-roblox-id-game-hack PDF link annotation
    • http://dygmotors.com.py/images/roblox-promo-codes-for-free-robux_GM431946152.pdfIn PDF document text
    • http://dygmotors.com.py/images/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://dygmotors.com.py/images/coin-master-hack-ios-without-verification_GM406889139.pdfIn PDF document text
    • http://dygmotors.com.py/images/free-roblox-shirt-templates-2021_GM431946152.pdfIn PDF document text
    • http://dygmotors.com.py/images/coin-master-free-spins-and-cards_GM406889139.pdfIn PDF document text
    • http://dygmotors.com.py/images/free-coin-master-coins_GM406889139.pdfIn PDF document text
    • http://dygmotors.com.py/images/free-daily-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://dygmotors.com.py/images/how-to-get-free-robux-without-paying-or-human-verification_GM431946152.pdfIn PDF document text
    • http://dygmotors.com.py/images/uprobuxcom-free-robux_GM431946152.pdfIn PDF document text
    • http://dygmotors.com.py/images/coin-master-twitter-free-spins_GM406889139.pdfIn PDF document text
    • http://dygmotors.com.py/images/how-can-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://dygmotors.com.py/images/how-to-hack-robux_GM431946152.pdfIn PDF document text
    • http://dygmotors.com.py/images/how-to-get-free-robux-instantly_GM431946152.pdfIn PDF document text
    • http://dygmotors.com.py/images/free-coins-and-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://dygmotors.com.py/images/minecraft-hacks-18-9_GM479516143.pdfIn PDF document text
    • http://dygmotors.com.py/images/how-to-get-minecraft-pe-for-free_GM479516143.pdfIn PDF document text
    • http://dygmotors.com.py/images/roblox-arsenal-hack_GM431946152.pdfIn PDF document text
    • http://dygmotors.com.py/images/free-coins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://dygmotors.com.py/images/free-robux-com-real_GM431946152.pdfIn PDF document text
    • http://dygmotors.com.py/images/free-robux-for-kids-no-verification_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004e8a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4E8A 28132 bytes
SHA-256: 34d0d8388e9dd9620b5190e41d7e152ba8f3f68b4f9a51b32e2c0e201ca95dd8
font_01_sfnt_off00008d7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D7A 2844 bytes
SHA-256: baad2f3f6808f4af03fa9398e38c580c8d846f7f773a947d8cc1f39b2753d31a
font_02_sfnt_off0000973c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x973C 18800 bytes
SHA-256: d0f8f0f546938330f44bb718db6a103fc9d7b00e094d10b01d15b6458765655d

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