Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc0f809d90842483…

MALICIOUS

PDF

40.4 KB Created: 2020-08-24 16:17:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bec84fd505d40929cb245b8c393962d5 SHA-1: 3f8c64ccaca66b5ab061b71c1f882e42fb1fd063 SHA-256: dc0f809d90842483c17db4eaf256b78b0301ac7275d06a1ab58ef3cfee1fa56d
150 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, a technique often used for SEO poisoning or to redirect users to malicious sites. One of the URLs, 'https://ttraff.cc/pify?keyword=android+browser+example+github', is flagged as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body contains obfuscated text and references to the redirector URL and other URLs hosted on Shopify, suggesting a link farm or redirection scheme.

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.cc/pify?keyword=android+browser+example+github
    • http://mabudajun.thelearningkirb.com/uploads/1/3/0/9/130969754/2213598.pdf
    • https://cdn.shopify.com/s/files/1/0433/7867/1783/files/mainstays_3_shelf_bookcase_instructions.pdf
    • https://cdn.shopify.com/s/files/1/0437/2014/7093/files/12522513592.pdf
    • https://cdn.shopify.com/s/files/1/0439/1141/3915/files/71371515682.pdf
    • https://cdn.shopify.com/s/files/1/0437/7201/8845/files/letter_combinations_of_a_phone_number_leetcode.pdf
    • https://cdn.shopify.com/s/files/1/0431/5666/8565/files/pilegopoxavaximisojaju.pdf
    • https://cdn.shopify.com/s/files/1/0447/2619/0234/files/xivofagunuvitap.pdf
    • https://cdn.shopify.com/s/files/1/0435/2576/7320/files/89617013162.pdf
    • https://cdn.shopify.com/s/files/1/0428/0451/0887/files/gamiriruko.pdf
    • https://cdn.shopify.com/s/files/1/0432/0854/0324/files/agricultural_research.pdf
    • https://cdn.shopify.com/s/files/1/0432/6499/9588/files/laravel_get_current_url.pdf
    • https://cdn.shopify.com/s/files/1/0435/8343/9011/files/spreadsheet_phpexcel_laravel.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_off00005e05.bin
308f70b2bc880d63685d924cfadf4daa41514b814c822a69a89a9039446c8951		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E05 5664 bytes
font_01_sfnt_off0000712b.bin
1806d70ef150949026e3a30d6ea897e00d22770afefb399f4faa80797a612540		 pdf-font-stream PDF embedded font (sfnt) at offset 0x712B 10576 bytes

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