Malicious PDF — malware analysis report

Static analysis result for SHA-256 51e727fad72713d9…

MALICIOUS

PDF

39.3 KB Created: 2020-08-31 01:17:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ec95f0a60c9460263eebd0bfbe1178d7 SHA-1: b87966f0ec997d28d0f8b103ad526107806512ba SHA-256: 51e727fad72713d964ede9b49f5aec2efe3477777832fee4069aefb63bd8a07a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.com'. The document body, though heavily obfuscated, also contains this URL, suggesting it's the primary lure. The presence of numerous other PDF links, many hosted on Shopify, indicates a link farm strategy to obscure the malicious destination. No scripts were extracted, and the PDF structure itself did not reveal further malicious intent beyond the redirector.

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.com/wix?keyword=the+art+of+rick+and+morty+pdf
    • https://cdn.shopify.com/s/files/1/0431/1685/5453/files/kiwisenesakokudibot.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/19463184481.pdf
    • https://cdn.shopify.com/s/files/1/0433/4957/3784/files/62167578719.pdf
    • https://cdn.shopify.com/s/files/1/0441/2869/8520/files/elus_cohen_rituals.pdf
    • https://static.usrfiles.com/ugd/0286dd_d0d3b56767b64328906908ff97741ccf.pdf
    • https://static.usrfiles.com/ugd/f515ca_67875daed83b48e5a675502425adbe17.pdf
    • https://static.usrfiles.com/ugd/d902bb_833e49eb6c8e41388cdcc39932ef353f.pdf
    • https://cdn.shopify.com/s/files/1/0434/9113/1554/files/moxunamoniruri.pdf
    • https://cdn.shopify.com/s/files/1/0439/8622/3262/files/grammar_practice_book_grade_6.pdf
    • https://cdn.shopify.com/s/files/1/0431/0604/2013/files/lonesakivabigole.pdf
    • https://cdn.shopify.com/s/files/1/0429/8201/5129/files/15204441566.pdf
    • https://static.usrfiles.com/ugd/e3ed1f_bd15647168824492bcd3d31d89ddd54b.pdf
    • https://static.usrfiles.com/ugd/01bc73_33c1cc6931b14b6b88240a0542768537.pdf
    • 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_off00005cc9.bin
ea34b7d0f3aea5363102ee317a93882ad18f5e0c89bfef555a5b73935cd3e27c
pdf-font-stream PDF embedded font (sfnt) at offset 0x5CC9 5300 bytes
font_01_sfnt_off00006eac.bin
756920faf18f8e0d7ca3e551866a5be4366efc5dc4508ab3008fec850e352000
pdf-font-stream PDF embedded font (sfnt) at offset 0x6EAC 9896 bytes