Malicious PDF — malware analysis report

Static analysis result for SHA-256 539d705269c805f3…

MALICIOUS

PDF

53.0 KB Created: 2020-08-12 11:12:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b5fd7becb3a2cabbfd815f799a50ebf2 SHA-1: 3bcb6b055dccf98fbcdb9323f09377865f5b27ae SHA-256: 539d705269c805f397b1a3f8aa6b05efdb01845574120f9ec4e93070b3d8235e
150 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, specifically identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the URL that is also present in the heuristics and the DOC BODY section. This suggests a phishing or redirection attack aimed at delivering further malicious content. The PDF_SEO_LINK_FARM heuristic indicates a large number of outbound links, likely for SEO manipulation or to obscure the malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • 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.
  • 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=public+policy+analysis+notes+pdf
    • http://files.clarionchristianschool.org/uploads/1/3/0/7/130740166/letopalijajefizetu.pdf
    • http://files.parboldtandoori.co.uk/uploads/1/3/1/3/131384635/lububekase.pdf
    • http://toleli.ajluxarts.com/uploads/1/3/0/7/130776760/sozotulebu.pdf
    • http://files.theferntree.com/uploads/1/3/0/7/130740196/pedene_guziw_pumusuz_jalepajuz.pdf
    • https://cdn.shopify.com/s/files/1/0430/3070/8385/files/43499129931.pdf
    • https://cdn.shopify.com/s/files/1/0432/3488/5796/files/duwelunivipajafonemama.pdf
    • https://cdn.shopify.com/s/files/1/0436/1030/8766/files/read_and_highlight_on_ipad.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lokilus.pdf
    • https://cdn.shopify.com/s/files/1/0434/0944/0924/files/pokemon_yellow_guide.pdf
    • https://cdn.shopify.com/s/files/1/0431/2160/6817/files/43924923043.pdf
    • https://cdn.shopify.com/s/files/1/0432/5936/3488/files/dk_space_encyclopedia_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/2619/4342/files/rizuvogokibuvufugodikalo.pdf
    • https://cdn.shopify.com/s/files/1/0448/6791/1842/files/local_anaesthesia_in_dentistry_book.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_off00009241.bin
13b38c652045c37f0cfecd290cd9df080a40bbc60cf30ef10403132cb51abd44		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9241 5296 bytes
font_01_sfnt_off0000a44f.bin
c976d8705c451c15fb31e1bdd0987e5c491638f02ff587af65767163eb952d90		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA44F 10188 bytes

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