Malicious PDF — malware analysis report

Static analysis result for SHA-256 e04a439c4f4fe80d…

MALICIOUS

PDF

43.7 KB Created: 2021-05-20 04:18:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: afa9e00268b08293f049987bddfef755 SHA-1: 422e9f8f855b5825c3602adbfa088d32c337b2da SHA-256: e04a439c4f4fe80dd089e721409206ad0493d3358aa6beccf546007d181cdac3
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 0.9969

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.xyz/app/431946152/free-roblox-shirts-templates-game-hack PDF link annotation
    • http://bit-sky.com/images/easy-robux_GM431946152.pdfIn PDF document text
    • http://bit-sky.com/images/rbx-claim_GM431946152.pdfIn PDF document text
    • http://bit-sky.com/images/how-to-get-free-robux-without-any-verification_GM431946152.pdfIn PDF document text
    • http://bit-sky.com/images/free-roblox-groups_GM431946152.pdfIn PDF document text
    • http://bit-sky.com/images/minecraft-the-complete-handbook-collection_GM479516143.pdfIn PDF document text
    • http://bit-sky.com/images/coin-master-hack-apk-no-survey_GM406889139.pdfIn PDF document text
    • http://bit-sky.com/images/free-links-for-free-coins-and-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://bit-sky.com/images/update-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://bit-sky.com/images/how-to-get-free-robux-easy_GM431946152.pdfIn PDF document text
    • http://bit-sky.com/images/roblox-earn_GM431946152.pdfIn PDF document text
    • http://bit-sky.com/images/coin-master-free-spins-and-coins-without-human-verification_GM406889139.pdfIn PDF document text
    • http://bit-sky.com/images/how-do-you-hack-roblox_GM431946152.pdfIn PDF document text
    • http://bit-sky.com/images/coin-master-gold-cards-hack-english_GM406889139.pdfIn PDF document text
    • http://bit-sky.com/images/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://bit-sky.com/images/free-spin-link-in-coin-master_GM406889139.pdfIn PDF document text
    • http://bit-sky.com/images/free-robux-easy_GM431946152.pdfIn PDF document text
    • http://bit-sky.com/images/how-to-get-free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
    • http://bit-sky.com/images/coin-master-free-spins-promo-code_GM406889139.pdfIn PDF document text
    • http://bit-sky.com/images/june-29-coin-master-hack-no-human-verification_GM406889139.pdfIn PDF document text
    • http://bit-sky.com/images/free-robux-no-email_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_off00004c70.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C70 25916 bytes
SHA-256: 8d71a1b62ae24cc07ebec048c346dfd6c7608edeedc3a5c01016ee106a514b9e
font_01_sfnt_off000086b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x86B0 19000 bytes
SHA-256: 9846c57f19aefef1863ce0f19602eeffc36beb237370d9673c8368dba1a12ee8

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