Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcde83bae68394ff…

MALICIOUS

PDF

237.5 KB Created: 2020-08-18 15:19:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c6fde9975fdbdf320acb0e702e0d59c2 SHA-1: f26c209d0bb117c6293195a3a0c9d50b321aa89a SHA-256: bcde83bae68394ff9349388fe846ad9898b75e48016c29bd10b60b3c777804d5
92 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, which is designed to lure users to potentially harmful content. The document body, though heavily obfuscated, contains the string 'Mueller report wiki', suggesting a social engineering pretext to entice clicks on the malicious link. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=mueller+report+wiki
    • http://xedusoxom.flyingpigrv.com/uploads/1/3/1/4/131438539/6871581.pdf
    • http://sitokonev.friendoffaith.org/uploads/1/3/0/7/130776760/a00c2.pdf
    • http://butebiluw.aznstra.com/uploads/1/3/0/7/130740596/da78c5ef7503b9e.pdf
    • https://cdn.shopify.com/s/files/1/0431/7007/0687/files/singer_sewing_machine_serial_number_g.pdf
    • https://cdn.shopify.com/s/files/1/0431/0351/8882/files/ruselaberekoluselediwesus.pdf
    • https://cdn.shopify.com/s/files/1/0430/1121/1417/files/robotic_arm_design_project.pdf
    • https://cdn.shopify.com/s/files/1/0428/6775/3116/files/29618003629.pdf
    • https://cdn.shopify.com/s/files/1/0430/3536/1442/files/44406856639.pdf
    • https://cdn.shopify.com/s/files/1/0430/7379/8306/files/vamogusenisetowusabitixin.pdf
    • https://cdn.shopify.com/s/files/1/0437/6500/6494/files/96861958839.pdf
    • https://cdn.shopify.com/s/files/1/0435/4146/3204/files/epdm_gasket_data_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/japoxotoruzub.pdf
    • https://cdn.shopify.com/s/files/1/0438/2549/6221/files/comment_associer_2_pages.pdf
    • https://cdn.shopify.com/s/files/1/0436/3550/7358/files/schedule_b_2020.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_off00036b38.bin
fbefd67a8f4558ecc3b281b0403d021a86da289c5b2a64184d0f448fdb6e6260		 pdf-font-stream PDF embedded font (sfnt) at offset 0x36B38 4584 bytes
font_01_sfnt_off00037af5.bin
3f523d53f1d075d15b35e5874759d74c39994c2396e10baa85c2a783570b105b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x37AF5 14248 bytes

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