Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdaa520c492ede0d…

MALICIOUS

PDF

38.6 KB Created: 2020-09-12 02:09:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 54861e173bce2c8e074ac4f3047aed3d SHA-1: bfdd96608552af0366f48998f2de1d87ab6731c6 SHA-256: fdaa520c492ede0d07d8bc67584492c2655258a3f5152b88f931c9449c3741ad
194 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://ttraff.link/wix?keyword=router+edge+guide+ryobi In PDF document text
    • http://files.luzthecakelady.com/uploads/1/3/1/6/131637850/fc1baa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static.usrfiles.com/ugd/9dda13_97b4935c5c484ea88d08979b3e5a887a.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/50de67_df5032ad72574fe48d66bad2c1b214d1.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/6c032c_fd5f31681a8442f6a3326a974fdf9b70.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/10b11f_5243a98813d849e585305c0aa3288287.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/804ff6_1a107dc3d6364551aa32f4aab725b0d2.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/3b7182_686d74a2b2dd448b9c5b97ee20e07ed5.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/c836c3_9adf83acf1304d9199a46983c9f525f8.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/5360f8_193edb3adc5b458483a580575c590f3d.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/1d3654_01f699c01f7f4c65b9c8ea0597d14d60.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/9f6a24_f5e4ff92849541b89d4b4cbdb91d0dd6.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000590d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x590D 4820 bytes
SHA-256: 451565409e47a54260198b5212b1c47d37736f5c7c3c2bdd8896f3e8ad23ec9f
font_01_sfnt_off00006991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6991 10768 bytes
SHA-256: c80b4e212fedf9e484b05b408dbbe1fffa8437b46be502ffa5daf9d248757f1c

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