Malicious PDF — malware analysis report

Static analysis result for SHA-256 e79227dbbcbf35f4…

MALICIOUS

PDF

49.7 KB Created: 2020-09-06 20:46:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2b0ab8971c370479e043405d9cf54e0f SHA-1: 58392c87bf7130ee7f70a9b1ef3048dd463b92a8 SHA-256: e79227dbbcbf35f47011f98658b0d409d381926d11708da3b857d20cba4e723f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL 'https://ttraff.me/wix?keyword=normal+central+venous+pressure+waveform', which is also listed as a malicious redirector. Additionally, the PDF exhibits characteristics of a link farm, with numerous embedded URLs pointing to external resources, some of which are also flagged as potentially 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.me/wix?keyword=normal+central+venous+pressure+waveform
    • https://static.usrfiles.com/ugd/fa6f14_12653567fedd437eb2d728de17e8727e.pdf
    • https://static.usrfiles.com/ugd/accd1f_c783051269244cba8c86e6cb0423cea9.pdf
    • https://static.usrfiles.com/ugd/564d2e_ae5cc409ac024afa8a5bce8f767d3c1f.pdf
    • https://static.usrfiles.com/ugd/cfa91a_a7cd2452db9a4fd9a480783683a052bc.pdf
    • https://cdn.shopify.com/s/files/1/0463/1321/0018/files/marathi_font_for_microsoft_office_2016.pdf
    • https://cdn.shopify.com/s/files/1/0437/7912/9501/files/julipotexuzere.pdf
    • https://cdn.shopify.com/s/files/1/0429/1903/5033/files/robotics_journal.pdf
    • https://cdn.shopify.com/s/files/1/0430/5348/2137/files/2014_bmw_x1_sdrive28i_owners_manual.pdf
    • https://cdn.shopify.com/s/files/1/0428/8164/6758/files/zixusidole.pdf
    • https://cdn.shopify.com/s/files/1/0431/9232/0161/files/42185855366.pdf
    • https://cdn.shopify.com/s/files/1/0428/3141/3414/files/digital_background_newborn.pdf
    • https://cdn.shopify.com/s/files/1/0451/6829/6090/files/76010897198.pdf
    • https://cdn.shopify.com/s/files/1/0437/4836/0343/files/ipratropium_albuterol_duoneb_davis.pdf
    • https://cdn.shopify.com/s/files/1/0467/9968/3735/files/detroit_pistons_injury_report_tonight.pdf
    • https://cdn.shopify.com/s/files/1/0450/2241/2958/files/asme_standard_pipe_sizes.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_off00008413.bin
2cd3607812a3a21f6f8b7fc0843553ccff56280bfe953fbf0d08b9a68ae63c11		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8413 5284 bytes
font_01_sfnt_off0000960a.bin
d131481f78b969207f2340dd1dd10940b63b6ecb387a6e4ce186d61b43da2d9d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x960A 10436 bytes

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