Malicious PDF — malware analysis report

Static analysis result for SHA-256 2876edf7e4861b7f…

MALICIOUS

PDF

51.3 KB Created: 2020-08-19 07:51:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ed4acd38d307a6aea288917b6f28a42f SHA-1: 8a75b8326155194acb1a89f5b58de1849d1f6420 SHA-256: 2876edf7e4861b7fec0051a3a5c9f312e1103c380b7fb88aa732347e16e9cf4b
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector at 'ttraff.com'. The document body, though heavily obfuscated, contains text related to 'Arnold chiari malformation surgery physical therapy' and the URLs, suggesting a lure to a phishing or scam page. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, limiting the analysis of specific execution behaviors.

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.com/pify?keyword=arnold+chiari+malformation+surgery+physical+therapy
    • http://files.melbatheater.com/uploads/1/3/2/8/132814969/b906f84da9d.pdf
    • http://datuvoxi.morethananight.com/uploads/1/3/2/6/132681393/3108556.pdf
    • http://files.fusionfightersdance.com/uploads/1/3/1/3/131381881/rivenefi.pdf
    • https://cdn.shopify.com/s/files/1/0428/0002/1667/files/59951226545.pdf
    • https://cdn.shopify.com/s/files/1/0432/4625/6295/files/excell_pressure_washer_engine_manual.pdf
    • https://cdn.shopify.com/s/files/1/0435/2992/8863/files/4l60e_rebuild_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/7674/7413/files/65951558718.pdf
    • https://cdn.shopify.com/s/files/1/0438/8120/1819/files/mponline_mp_board_duplicate_marksheet_online_apply.pdf
    • https://cdn.shopify.com/s/files/1/0436/4448/5790/files/redact_adobe_acrobat_standard_dc.pdf
    • https://cdn.shopify.com/s/files/1/0437/9626/7168/files/discord._py_rewrite_music_bot.pdf
    • https://cdn.shopify.com/s/files/1/0431/0122/5114/files/police_report_car_accident_sample.pdf
    • https://cdn.shopify.com/s/files/1/0429/5042/6787/files/sentence_or_fragment_worksheet_grade_3.pdf
    • https://cdn.shopify.com/s/files/1/0440/3508/0342/files/retadenejasaka.pdf
    • https://cdn.shopify.com/s/files/1/0432/9648/9632/files/57627721620.pdf
    • https://cdn.shopify.com/s/files/1/0430/4440/5397/files/xadolujobuzuduxepafuselo.pdf
    • https://cdn.shopify.com/s/files/1/0430/6167/4133/files/83261098235.pdf
    • https://cdn.shopify.com/s/files/1/0435/3405/7621/files/51024867334.pdf
    • https://cdn.shopify.com/s/files/1/0450/9266/7544/files/sosedulalilesotonobiwimep.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_off0000888f.bin
c4a90507ba211034ed0298bc73edfd892c63b0cc522ac61bad795cc431891697		 pdf-font-stream PDF embedded font (sfnt) at offset 0x888F 5660 bytes
font_01_sfnt_off00009ba2.bin
6c744fa1efdb789d37f53812bb8784e43c1f88ef745d07fb04071eeca354c58e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9BA2 10616 bytes

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