Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d06bb7e33c181a3…

MALICIOUS

PDF

40.7 KB Created: 2020-09-21 06:22:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3238bc587cbd060cbea073c0ba1d7dc1 SHA-1: 21c7b6e7daf031d5dbe8995e87e7a7e6d7c5c92d SHA-256: 2d06bb7e33c181a3c13672c357eead52e0a492ad171343c06455f220555c08ae
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a deceptive title 'Frog dissection guide answers' to entice users to click on embedded links. The primary link, 'https://ttraff.link/wix?keyword=frog+dissection+guide+answers', is identified as a malicious redirector. The document also hosts a large number of other PDF links, suggesting a link farm for SEO manipulation or further distribution of malicious content. The ML classifier strongly flagged this PDF as malicious.

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.
  • 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.
  • 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=frog+dissection+guide+answers
    • http://files.mybodyofknowledge.net/uploads/1/3/0/8/130813731/xopov.pdf
    • http://files.mrragersblog.com/uploads/1/3/0/7/130739810/wotasa-ranatusesafefi.pdf
    • http://tiwiwof.tiadaghtonvalleyrr.com/uploads/1/3/0/7/130775778/3612400.pdf
    • http://velav.708boutique.com/uploads/1/3/1/4/131406592/busadexetagi-zopogi.pdf
    • http://files.unidadepastoral.com/uploads/1/3/1/4/131437351/195585ef.pdf
    • https://8c35c801-d1a1-4870-a0fa-56aa2a8f19c6.filesusr.com/ugd/4ae4db_f88181f2a6c7480faac5311469dadf7c.pdf?index=true
    • https://ddb8ec48-9825-41ef-b3ff-6b2fdc75991d.filesusr.com/ugd/f6a907_9f7ce1fb22da49dd94b4f1d1cb89a21e.pdf?index=true
    • https://da56c377-c5a7-4e13-85a7-9d70d4caded1.filesusr.com/ugd/3bca44_fb2af1f5f7b54ddba898c8e9e820c933.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0434/8762/5369/files/zokadabuwegukewumit.pdf
    • https://cdn.shopify.com/s/files/1/0433/2643/9582/files/biology_text_book_class_11.pdf
    • https://cdn.shopify.com/s/files/1/0465/1991/0558/files/best_sheets_for_bed_bugs.pdf
    • https://f194912e-201f-4d2b-86e2-0a60335ae137.filesusr.com/ugd/b58d21_377565fde0e24d01a8e4c0988ff5b73b.pdf?index=true
    • https://374bcefe-9534-4efe-8edd-8e625910d8ef.filesusr.com/ugd/b80405_e7210e7afa1143c8b8c61d1381d6bda6.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006274.bin
7935fc585d7d2c7d4aea78e68a056f4dc89badf9cc8f8d0c92a15326ed08172a
pdf-font-stream PDF embedded font (sfnt) at offset 0x6274 5120 bytes
font_01_sfnt_off00007407.bin
7ee5483b25cd8469d42e2be130297a2e22cd9efa2bb9a1a562b054ecdb1c46d9
pdf-font-stream PDF embedded font (sfnt) at offset 0x7407 10084 bytes