Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8bf76740e813cc8…

MALICIOUS

PDF

44.1 KB Created: 2020-10-29 20:56:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 6d0262cbc8959ca87496d87e18d9cae5 SHA-1: e7e8cc90537a7c21870d352c10828e4ac98ba810 SHA-256: f8bf76740e813cc897341e1385b3b73a72841c17619f21128d05bc641466889b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains heuristics indicating it is a malicious redirector, specifically designed to lure users with a fake download link. The embedded URL `https://ttraff.club/123?keyword=1-1+practice+worksheet+relations+and+functions+answer+key` is identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, reinforcing the phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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.club/123?keyword=1-1+practice+worksheet+relations+and+functions+answer+key In PDF document text
    • https://nitetezelimon.weebly.com/uploads/1/3/1/4/131438651/bubirisonisa_fedanalesi_fikafugegira.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wenobagupexekap/coa_certificate_of_analysis.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/23932101064.pdfIn PDF document text
    • https://s3.amazonaws.com/paropabaru/alfred_adler_theory_of_motivation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f923acca-b95f-4231-8235-0c0c5d044a1c/beruko.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/6341/9815/files/22459565570.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/cambridge_advanced_vocabulary_list.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0507/3013/9820/files/32720002192.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c4a885a-b532-4966-be45-41beb492c0b3/lobasurajoguk.pdfIn PDF document text
    • https://s3.amazonaws.com/mujevubutukoxu/how_to_follow_someone_on_facebook_that_you_unfollowed.pdfIn PDF document text
    • https://s3.amazonaws.com/jaxesabi/jersey_mike_subs_nutrition.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000548c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x548C 5488 bytes
SHA-256: 9365d25f8c8e345396dd881a36f86247195b4e6be22de300d1ef5b7c6fa8b1bb
font_01_sfnt_off00006755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6755 11336 bytes
SHA-256: d23afd28643a1b31258e27b3b4a91633bba9d7fa1fc92d99128cef7641610983
font_02_sfnt_off00008e20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E20 16144 bytes
SHA-256: a0532d1212509dae036733b1fb6f303b0d7fd7a209d3928fdad713008da19d30