Malicious PDF — malware analysis report

Static analysis result for SHA-256 55a39146346c4f35…

MALICIOUS

PDF

209.2 KB Created: 2020-08-16 14:07:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2935f220c4f2c1e046a78a62599a98ec SHA-1: 8fa0aac2535fd71507a3a710506307910dbcc231 SHA-256: 55a39146346c4f35db80789464876dd680a83fe0310da16009197fa4494c3e87
94 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to ttraff.com. The document body, though heavily obfuscated, contains the same URL, suggesting it is the primary lure. The ML classifier also flagged this PDF as malicious with high confidence. No scripts were extracted, and the PDF structure itself did not reveal further malicious intent beyond the embedded link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 3

  • 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.
  • 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/pify?keyword=bollywood+top+100+songs++320kbps
    • http://files.peerprivatelessons.org/uploads/1/3/0/9/130969573/bb08c1a4.pdf
    • https://cdn.shopify.com/s/files/1/0433/4675/5734/files/sesid.pdf
    • https://cdn.shopify.com/s/files/1/0444/5070/9671/files/2.pdf
    • https://cdn.shopify.com/s/files/1/0436/9963/4326/files/glencoe_geometry_chapter_7_quiz_2_answers.pdf
    • https://cdn.shopify.com/s/files/1/0433/9151/6826/files/55985381970.pdf
    • https://cdn.shopify.com/s/files/1/0431/7675/5349/files/morphological_classification_of_fungi.pdf
    • https://cdn.shopify.com/s/files/1/0451/2251/9205/files/deloitte_aptitude_test_papers.pdf
    • https://cdn.shopify.com/s/files/1/0438/5187/4466/files/baixar_em_pdf_livros_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0432/7741/8656/files/android_studio_change_name_of_app.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0002f671.bin
1456d3d5bfd5eb92fab5cf4a0662007bc4012cacaaf8b05a753130ed8fa55ff7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2F671 5756 bytes
font_01_sfnt_off00030a49.bin
4aea12e68f75406c18c4466ce5d46ca8ecd6a85b46319029a156c009bb496466		 pdf-font-stream PDF embedded font (sfnt) at offset 0x30A49 14800 bytes

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