Malicious PDF — malware analysis report

Static analysis result for SHA-256 4569cb21b8dc6f76…

MALICIOUS

PDF

41.9 KB Created: 2021-05-11 20:07:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: a515fe077b028455bd0067e519b8055d SHA-1: 5430d6779ce95f97e17dcf9df10d18756346a8bb SHA-256: 4569cb21b8dc6f7602fa0e35db4917ddcb726902766d26dec9ee6875692629a6
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to other PDF files, suggesting a link farm or SEO spamming operation. One prominent link directs to 'coin-master-free-spin-realme-products-game-hack'. The presence of a 'PDF_SEO_LINK_FARM' heuristic firing and the ML classifier's high confidence score indicate malicious intent. While no scripts were directly extracted, the structure and embedded links are indicative of a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 4

  • 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.
  • 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/406889139/coin-master-free-spin-realme-products-game-hack PDF link annotation
    • http://origamiperu.com/images/what-is-exploiting-in-roblox_GM431946152.pdfIn PDF document text
    • http://origamiperu.com/images/free-spins-on-coin-masters_GM406889139.pdfIn PDF document text
    • http://origamiperu.com/images/free-robux-2021_GM431946152.pdfIn PDF document text
    • http://origamiperu.com/images/hack-coin-master-free_GM406889139.pdfIn PDF document text
    • http://origamiperu.com/images/how-to-get-minecraft-for-free-on-ipad_GM479516143.pdfIn PDF document text
    • http://origamiperu.com/images/coin-master-free-shield-link_GM406889139.pdfIn PDF document text
    • http://origamiperu.com/images/2021-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://origamiperu.com/images/coin-master-free-coins-cheat_GM406889139.pdfIn PDF document text
    • http://origamiperu.com/images/coin-master-daily-bonus-hack_GM406889139.pdfIn PDF document text
    • http://origamiperu.com/images/free-robux-working_GM431946152.pdfIn PDF document text
    • http://origamiperu.com/images/coin-master-tiradas-gratis-link_GM406889139.pdfIn PDF document text
    • http://origamiperu.com/images/how-to-hack-to-get-robux_GM431946152.pdfIn PDF document text
    • http://origamiperu.com/images/coin-master-free-spin-no-offers_GM406889139.pdfIn PDF document text
    • http://origamiperu.com/images/robux-prices_GM431946152.pdfIn PDF document text
    • http://origamiperu.com/images/coin-master-35-16-hack-apk_GM406889139.pdfIn PDF document text
    • http://origamiperu.com/images/coin-master-daily-rewards-link_GM406889139.pdfIn PDF document text
    • http://origamiperu.com/images/how-to-make-your-own-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://origamiperu.com/images/how-do-you-get-free-food-on-coin-master_GM406889139.pdfIn PDF document text
    • http://origamiperu.com/images/coin-master-free-spins-2021-blogspot_GM406889139.pdfIn PDF document text
    • http://origamiperu.com/images/free-robux-clothes_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000048f9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x48F9 24216 bytes
SHA-256: 8bbac51750746bd35d0130e0d6f389dc6192e94f2a8c4498807d9dda36f3f4a2
font_01_sfnt_off00008061.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8061 18688 bytes
SHA-256: 2b96984a12e9234f7a54c21b84caea4c40bc9a6928fd3166a16ecb8c3482d419

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