Malicious PDF — malware analysis report

Static analysis result for SHA-256 89d526ec5059a35f…

MALICIOUS

PDF

67.0 KB Created: 2020-08-19 22:22:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fb312dc522b1d020eeff4c5f04e9e8a9 SHA-1: b67d5cd130b949a5ece740dd3446179f79e46f72 SHA-256: 89d526ec5059a35f6e8b50a8b8a4fe5effebbae2bea162a8b50e98cfb31cd142
152 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.ru'. Additionally, another critical heuristic indicates a PDF link farm, suggesting an attempt to distribute or obscure malicious links. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, appears to contain the malicious URL.

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.ru/pify?keyword=laughing+businessman+meme+template
    • http://nepoda.hannaryynanen.com/uploads/1/3/1/3/131398404/rijakodupuletiw_wopatumewefu_zubujagolulole.pdf
    • https://cdn.shopify.com/s/files/1/0434/0046/2503/files/google_analytics_tutorial_2020.pdf
    • https://cdn.shopify.com/s/files/1/0435/2697/9739/files/god_of_wonders_piano_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0430/2202/4867/files/texewaliwikupitelolitub.pdf
    • https://cdn.shopify.com/s/files/1/0452/1410/5760/files/using_appendix_in_report.pdf
    • https://cdn.shopify.com/s/files/1/0432/3488/5796/files/duwijivisagezasu.pdf
    • https://cdn.shopify.com/s/files/1/0432/0971/9965/files/tuwukudusakomikokese.pdf
    • https://cdn.shopify.com/s/files/1/0434/5787/2033/files/associer_deux_documents.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/94323725826.pdf
    • https://cdn.shopify.com/s/files/1/0435/1148/0472/files/31516175542.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_off0000c1a0.bin
b330fc666d6a8192d8b01b9a90aa7c7d00c71d0dd6e5d6c218aac2812965b896		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC1A0 5220 bytes
font_01_sfnt_off0000d33a.bin
c5a47b379aa921a455b6fa5c65527b656e6e867fbbb46ee6595a08810e5b4c3a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD33A 13992 bytes

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