Malicious PDF — malware analysis report

Static analysis result for SHA-256 315bb1f6df5e59f1…

MALICIOUS

PDF

39.8 KB Created: 2020-09-05 19:12:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 02f22e67f22574773139953ff311a41f SHA-1: 2ca7d35bf3c22ba07ccf32a22d69b6d2468a1291 SHA-256: 315bb1f6df5e59f15d6cf314cf28cfae24709a6823528f3ac994b48eb4bf3884
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically pointing to 'ttraff.ru'. The document body, though heavily obfuscated, contains this URL and numerous other links to Shopify-hosted PDFs, suggesting a link farm or SEO poisoning tactic. The ML classifier also strongly indicated maliciousness.

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=omkretsen+av+en+sirkel+formel 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/1/0430/6383/6834/files/21047207220.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1481/4885/files/kurosebifipevowoj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5598/8387/files/mitetipodepapesexe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8076/0990/files/witovelefomozokirif.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0829/4039/files/38316484873.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0461/7689/5129/files/34665163705.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7288/8742/files/git_undo_commit_but_keep_changes.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3581/9173/files/kajuvomizisebesokozus.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3042/1410/files/92345553397.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/8069/4437/files/acrobat_editor_free_download_for_windows_10.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/edb4a7_2bcd740c478840e2b53b70499839f9c3.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/e78b77_c6f9a6c48de54a8999663e997d13b42a.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/12daa7_3750ed2c29244e5f9ebad975423e9fcf.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/735189_a2c168b54309444bb378e922c0d1d2bf.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/65b209_9b3cff8acb544a5bb9a5c195a16dffa0.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_off00005d40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D40 5064 bytes
SHA-256: cbfd2faf118d3951e59da170f27ff7d569199502e43f56d13b6083fa98122f2c
font_01_sfnt_off00006e6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E6A 10380 bytes
SHA-256: cf858eb3b93db985d32c48ae0d010098a0e53f5603a93882ad48ebeecbe36445

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