Malicious PDF — malware analysis report

Static analysis result for SHA-256 8458b7c33b31bc28…

MALICIOUS

PDF

40.3 KB Created: 2020-09-07 18:49:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 088d3a36a9ac60e004a97ab12c0ae1fb SHA-1: e4f75324d71694b3a618a8f7b69bca4f9698fc77 SHA-256: 8458b7c33b31bc287939085f537572e07a346560defa9f8e1a5061d2cd411280
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.club'. This URL is embedded within the document body, disguised as a link to book templates. The PDF also exhibits characteristics of an SEO link farm, containing numerous links to other PDFs, likely to manipulate search engine results or distribute further malicious content. The ML classifier strongly flagged this PDF as malicious.

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=createspace+indesign+book+templates
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/3017/4113/files/comprehensive_core_clinical_cases_self_assessment_for_medical_students.pdf
    • https://cdn.shopify.com/s/files/1/0428/1548/8163/files/macmillan_check_your_aviation_english.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pejodogidevetakuranuwa.pdf
    • https://cdn.shopify.com/s/files/1/0430/7514/1783/files/cambridge_grade_7_maths_past_papers.pdf
    • https://cdn.shopify.com/s/files/1/0437/8676/4446/files/xcom_2_experimental_armor.pdf
    • https://cdn.shopify.com/s/files/1/0430/3945/7431/files/59527338250.pdf
    • https://cdn.shopify.com/s/files/1/0434/4256/9382/files/91621634516.pdf
    • https://cdn.shopify.com/s/files/1/0428/7243/8947/files/wubikelus.pdf
    • https://static.usrfiles.com/ugd/e643da_9602d7ec893b41ffa0af2f3860fe411d.pdf
    • https://static.usrfiles.com/ugd/ea2f88_f3fca6905d614d25b4c5ac3dccffbf77.pdf
    • https://static.usrfiles.com/ugd/b972d5_a58f88224d8b476c89ebc174e52f1d9d.pdf
    • https://static.usrfiles.com/ugd/18f527_e302430485bb4bbda950e55f14c0f8a5.pdf
    • https://cdn.shopify.com/s/files/1/0431/6276/3425/files/evening_snacks_recipe.pdf
    • https://cdn.shopify.com/s/files/1/0432/3019/9966/files/63092160132.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_off00005fc9.bin
c01a72a0fd8efebaf8b0d424a90d297ddb943859ca52f055b56407a86d8b9d57
pdf-font-stream PDF embedded font (sfnt) at offset 0x5FC9 5504 bytes
font_01_sfnt_off00007261.bin
34d7fa78ef7118a490297b99ff633a65a0512c381bf3f7a01a732a27be76013d
pdf-font-stream PDF embedded font (sfnt) at offset 0x7261 10032 bytes