Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6f52ad300d4d96e…

MALICIOUS

PDF

43.5 KB Created: 2020-08-27 16:25:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e47e7397f017a5438906026173ff8980 SHA-1: 6f448cf7c371992e3c39df89d3fdc61eb73bc598 SHA-256: b6f52ad300d4d96e9c1c20cddec9a7f9854bd6e90ab9ae9ecb0355a1dca12552
154 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/pify?keyword=k%2525C3%2525BCf%2525C3%2525BCrl%2525C3%2525BC+telefon+%2525C5%25259Fakas%2525C4%2525B1+indir'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, including 'https://cdn.shopify.com/s/files/1/0430/5698/8311/files/dileg.pdf'. The ML classifier also strongly indicated maliciousness. The document body, though heavily corrupted, contains fragments of the malicious URL and benign-looking PDF filenames, suggesting a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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=k%2525C3%2525BCf%2525C3%2525BCrl%2525C3%2525BC+telefon+%2525C5%25259Fakas%2525C4%2525B1+indir
    • http://files.smartconsulting.net/uploads/1/3/0/7/130776276/zibonamovupepi.pdf
    • https://cdn.shopify.com/s/files/1/0430/5698/8311/files/dileg.pdf
    • https://cdn.shopify.com/s/files/1/0435/6374/5441/files/generator_excitation_system.pdf
    • https://cdn.shopify.com/s/files/1/0437/2499/6773/files/71514750017.pdf
    • https://cdn.shopify.com/s/files/1/0433/6756/3418/files/wujesov.pdf
    • https://cdn.shopify.com/s/files/1/0431/6761/3087/files/dixisirani.pdf
    • https://cdn.shopify.com/s/files/1/0440/0673/6037/files/12249904463.pdf
    • https://cdn.shopify.com/s/files/1/0431/2806/2109/files/runavunikupoviriwofavof.pdf
    • https://cdn.shopify.com/s/files/1/0429/0733/6857/files/chef_s_kitchen_pressure_cooker_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/4872/9766/files/39356968748.pdf
    • https://cdn.shopify.com/s/files/1/0439/9045/0334/files/80021713714.pdf
    • https://cdn.shopify.com/s/files/1/0440/5267/6773/files/beps_action_1_final_report.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004800.bin
57b2e07ba2e274dbe73445350082d5bba7281627a1c7151843944f6ea83724dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4800 3036 bytes
font_01_sfnt_off00005511.bin
fd012656c0cde8d4e3879640bacc9eb67db201f33bc8b33f932d7a80385668f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5511 5336 bytes
font_02_sfnt_off0000668a.bin
7dfdd818dcf47bfd5bdbfc25ae47748ec4a07b4e1038b7db0b03b9c23d9880b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x668A 2400 bytes
font_03_sfnt_off0000700f.bin
b97c586eb6bc80580d88befa13421ab30360ab5da8be06bfa7c2f10e59516d40		 pdf-font-stream PDF embedded font (sfnt) at offset 0x700F 15276 bytes

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