Malicious PDF — malware analysis report

Static analysis result for SHA-256 f765eaba4f470b70…

MALICIOUS

PDF

44.9 KB Created: 2020-09-17 00:11:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 14ce5bf72c655d3a81fa92f22200a1c1 SHA-1: 26c59533eee593d33f74c33e0f2ca7e5144645d2 SHA-256: f765eaba4f470b70d0e1455aa1a27654920ce16ceb7f9c58257d7a7c06a0f214
152 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, pointing to 'https://ttraff.club/wix?keyword=the+cuckoo%2527s+calling+pdf+espa%25C3%25B1ol'. Additionally, it exhibits characteristics of a PDF link farm, with numerous external links, many of which are to unknown or potentially malicious domains. The document body, though heavily obfuscated, contains the same suspicious URL, suggesting an attempt to trick users into clicking it. 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.club/wix?keyword=the+cuckoo%2527s+calling+pdf+espa%25C3%25B1ol
    • http://wireti.wintersilversmiths.com/uploads/1/3/0/9/130969445/faxufene_nekotewowukiv_wujujikuku.pdf
    • http://newinur.artclassdallas.com/uploads/1/3/2/6/132695969/majodo.pdf
    • http://gepirub.circularfood.net/uploads/1/3/1/6/131636664/kopopanutavasavepo.pdf
    • https://cdn.shopify.com/s/files/1/0431/0692/6741/files/ruduxetezez.pdf
    • https://cdn.shopify.com/s/files/1/0433/8896/0933/files/the_psychopath_test_a_journey_through_the_madness_industry_by_jon_ronson.pdf
    • https://cdn.shopify.com/s/files/1/0431/4578/9600/files/kalagobexud.pdf
    • https://cdn.shopify.com/s/files/1/0428/9334/4924/files/zarizafuvipu.pdf
    • https://cdn.shopify.com/s/files/1/0432/2797/1741/files/sotedewuwu.pdf
    • https://cdn.shopify.com/s/files/1/0436/5543/0302/files/rusaluzogizonavexag.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zosogorimojafi.pdf
    • https://cdn.shopify.com/s/files/1/0434/9086/9410/files/maxiscan_ms309_not_connecting.pdf
    • https://cdn.shopify.com/s/files/1/0436/3531/0752/files/boss_katana_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/1551/1968/files/bird_43_wattmeter_calibration_proced.pdf
    • https://cdn.shopify.com/s/files/1/0439/3772/6622/files/d_d_beyond_character_sheet_offline.pdf
    • https://cdn.shopify.com/s/files/1/0434/4355/2423/files/58910453798.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/
    • https://cdn.shopify.com/s/files/1/0436/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006df8.bin
55d94c83fb64a2c372dea41a2e682642561db4fe4187e017039033b2244dc1c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DF8 5580 bytes
font_01_sfnt_off000080c0.bin
72fa1a68821caf5e6ad149ba6d8b9eb7833758769348aaf2151786711db35a27		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80C0 10512 bytes

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