Malicious PDF — malware analysis report

Static analysis result for SHA-256 c07752ca25294f86…

MALICIOUS

PDF

45.5 KB Created: 2021-05-16 20:42:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 9f5a30d7dce0111dcea1446d325298e3 SHA-1: ac74ab1355393f65f97ec73c4232ceaa5d6a0de9 SHA-256: c07752ca25294f868e63a328656849c63fb70f9bdaefd2f860c339c250054bee
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of external links, many of which point to SEO-optimized PDF files, indicating a link farm. The document body and extracted URLs suggest a lure related to 'free Robux' or game hacks, a common theme in phishing and scam campaigns. The presence of a password archive lure suggests an attempt to bypass security scanning by encrypting a malicious payload.

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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.xyz/app/431946152/free-robux-generator-2021-game-hack PDF link annotation
    • http://serviio.org/images/easy-robux-today-com_GM431946152.pdfIn PDF document text
    • http://serviio.org/images/free-spins-and-coins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://serviio.org/images/daily-spin-and-coin_GM406889139.pdfIn PDF document text
    • http://serviio.org/images/websites-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://serviio.org/images/coin-master-free-pin_GM406889139.pdfIn PDF document text
    • http://serviio.org/images/how-to-get-free-robux-not-a-scam_GM431946152.pdfIn PDF document text
    • http://serviio.org/images/free-robux-no-downloading-apps_GM431946152.pdfIn PDF document text
    • http://serviio.org/images/mcpe-master-hack-unlimited-coins-latest-version_GM406889139.pdfIn PDF document text
    • http://serviio.org/images/free-roblox-gift-card-codes_GM431946152.pdfIn PDF document text
    • http://serviio.org/images/free-roblox-gift-card-codes-2021-unused_GM431946152.pdfIn PDF document text
    • http://serviio.org/images/codes-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://serviio.org/images/20-free-spin-link-coin-master_GM406889139.pdfIn PDF document text
    • http://serviio.org/images/free-roblox-followers-generator_GM431946152.pdfIn PDF document text
    • http://serviio.org/images/free-robux-pins_GM431946152.pdfIn PDF document text
    • http://serviio.org/images/coin-master-hack-no-human-verification-2021_GM406889139.pdfIn PDF document text
    • http://serviio.org/images/can-u-get-free-robux_GM431946152.pdfIn PDF document text
    • http://serviio.org/images/free-robux-survey_GM431946152.pdfIn PDF document text
    • http://serviio.org/images/how-to-hack-coin-master-apkmody_GM406889139.pdfIn PDF document text
    • http://serviio.org/images/how-to-get-free-robux-games_GM431946152.pdfIn PDF document text
    • http://serviio.org/images/easy-ways-to-get-free-robux_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_003_off00004800.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4800 32512 bytes
SHA-256: 5eba0293de36e2579f2ce4ea1ae7bff516eb4667bd3cfb35e43dfa8bf890a911
font_01_sfnt_off00008e43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E43 18748 bytes
SHA-256: fca1806ffff7593a0a2d811b077fe14576afb362c0c2e8ffc695fbf8edc3964d

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