Malicious PDF — malware analysis report

Static analysis result for SHA-256 43878aec1c388af1…

MALICIOUS

PDF

36.4 KB Created: 2020-11-01 17:59:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 37f71da6ddb4d02aa99588c794acf97e SHA-1: 1b04cbc7e672552731a0fc45c1cef87ec01417e8 SHA-256: 43878aec1c388af1bcf5a432b9844cda7b7d05c79653114e9b1b164326810ae6
92 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing indicating a malicious redirector link. The embedded URL, https://cctraff.ru/123?keyword=circles+and+arcs+worksheet+answers, is a primary indicator of malicious intent. While no scripts were explicitly extracted, the PDF structure and the presence of malicious URLs suggest an attempt to lure the user to a compromised site, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 2

  • 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.
  • 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://cctraff.ru/123?keyword=circles+and+arcs+worksheet+answers In PDF document text
    • https://kufojomarolov.weebly.com/uploads/1/3/4/4/134401526/3426524.pdfIn PDF document text
    • https://ditiwudo.weebly.com/uploads/1/3/1/4/131452947/ruvewa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367938/normal_5f8d3b956c36c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385859/normal_5f9693eadd440.pdfIn 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/1/0505/1164/2810/files/47486855696.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/5068/7387/files/deer_breeds_in_australia.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/9669/7768/files/fellowes_powershred_420c_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48144c1f-b7ed-4595-8791-5be3cf5e42ed/55711705619.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/4535/5171/files/repeated_games_with_incomplete_information.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/4606/3258/files/58216473428.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0507/4852/2668/files/vocabulary_workshop_level_c_unit_12_answer_key.pdfIn 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_off0000583e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x583E 5088 bytes
SHA-256: b2695cca598ec4fa62fbe842e091590b89ea6488dd47be7473dd305463e044d6
font_01_sfnt_off00006993.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6993 10848 bytes
SHA-256: a3de038bd164faa3f46c0a1ba3a8dbb383390d0ea74e40b60ac33db14c57d8c9

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