Malicious PDF — malware analysis report

Static analysis result for SHA-256 84ec29cf07628bf9…

MALICIOUS

PDF

40.1 KB Created: 2020-08-31 10:43:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b972177a710f7dc757e1e5d7e6e74a3a SHA-1: 78a0332cac9846fbcf3d3d94b5996d3be2f40374 SHA-256: 84ec29cf07628bf9ce7475b25767fc693744c3cad57f573d5dba6dcb01b49b0a
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a link to a known malicious redirector at 'https://ttraff.ru/wix?keyword=comic+strip+template'. The document body, though heavily obfuscated, contains text suggesting it is a 'comic strip template', likely a lure. The presence of many external PDF links, including one to 'https://cdn.shopify.com/s/files/1/0439/3671/0824/files/gipinuxabodoxojoxodikojaf.pdf', indicates a link farm strategy, potentially for SEO poisoning or distributing further malicious content.

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.ru/wix?keyword=comic+strip+template
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0439/3671/0824/files/gipinuxabodoxojoxodikojaf.pdf
    • https://cdn.shopify.com/s/files/1/0432/5575/9011/files/zamotila.pdf
    • https://cdn.shopify.com/s/files/1/0432/8403/7792/files/copy_certification_by_document_custodian.pdf
    • https://cdn.shopify.com/s/files/1/0432/1542/1600/files/canticos_espirituales.pdf
    • https://cdn.shopify.com/s/files/1/0435/5565/1743/files/8461985804.pdf
    • https://cdn.shopify.com/s/files/1/0433/3309/1480/files/animal_farm_novel_in_urdu_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/7935/9900/files/social_impact_assessment_process.pdf
    • https://cdn.shopify.com/s/files/1/0431/6309/1112/files/71335375691.pdf
    • https://cdn.shopify.com/s/files/1/0435/2930/6263/files/96727232681.pdf
    • https://cdn.shopify.com/s/files/1/0437/8863/2213/files/sql_server_express_2014_iso.pdf
    • https://static.usrfiles.com/ugd/ff2e72_ec1b0294985b4036b1b9ae209a9f6dab.pdf
    • https://static.usrfiles.com/ugd/87a178_283e049be58c4e52ae1930a9e8c0ae81.pdf
    • https://static.usrfiles.com/ugd/0789d5_05959485e67c428e868ddf2fccfca180.pdf
    • https://static.usrfiles.com/ugd/b8c837_a3e7be759fe04d28b8091b7f5141e79f.pdf
    • https://cdn.shopify.com/s/files/1/0451/1835/7669/files/where_is_hosts_file_in_windows_7.pdf
    • https://cdn.shopify.com/s/files/1/0433/4492/0734/files/casey_at_the_bat_answer_key.pdf
    • https://cdn.shopify.com/s/files/1/0434/8660/9573/files/20924450528.pdf
    • https://cdn.shopify.com/s/files/1/0428/0962/2691/files/cognos_11_export_report_to_excel.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f60.bin
e4931da87a895dd7e8adf36a2182c2e3dd7284f4d0f30acf541d1e5039cec762		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F60 4984 bytes
font_01_sfnt_off00007033.bin
717c5efc7b3fec3654e63d59eea61df94bd85afe64b5e9872005b2c83afe0328		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7033 10452 bytes

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