Malicious PDF — malware analysis report

Static analysis result for SHA-256 76e4781bf4031f5c…

MALICIOUS

PDF

45.5 KB Created: 2020-08-31 12:18:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: c18b979c89bf92291c2030377657764b SHA-1: 9e104414fd232683a651e06fbfeef857d1472161 SHA-256: 76e4781bf4031f5c7ecdc4556b072512aa46a9161dd0b2065b785ffb454bdfe2
162 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which points to a known malicious redirector. The document body, though heavily obfuscated, contains text suggesting a lure related to 'avalon card game rules pdf'. The presence of numerous other PDF links, many pointing to Shopify, suggests a link farm or SEO poisoning tactic to distribute the malicious PDF. The ML classifier strongly flagged this PDF as malicious.

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=avalon+card+game+rules+pdf In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3391/0681/files/xuzubuke.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9850/5377/files/add_blank_page_in_file.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9433/4870/files/arithmetic_sequence_worksheet_grade_10.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5229/3541/files/desaj.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/cd79e3_111284eac76242bc998a88c40b8dcaae.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8607/6309/files/14201335393.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6287/8618/files/fantasy_calendar_generator.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8099/7269/files/modal_verbs_worksheet.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/111c46_dd38baabb02a45d4871b14d54f7b6d0e.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_6352984f58774b3cb93fce3595cffd94.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_c256828c855547359a80938226cdcb4e.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/191a6d_0fb9edc9355c44b38c14934b82ead903.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_off0000736b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x736B 5524 bytes
SHA-256: 4eb4a7ffe8220f437730188670562a5cbeb6dc75a1864d08a5e35deec2b89c1c
font_01_sfnt_off00008620.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8620 10368 bytes
SHA-256: d2357c0d9a48efd9e806afe4ddadac0cb263cac2d1a06544b2709d012e4945ae

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