Malicious PDF — malware analysis report

Static analysis result for SHA-256 d940d1fdc41d8604…

MALICIOUS

PDF

39.8 KB Created: 2020-08-21 20:15:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2a5d0761e9d7d00a3823370647b7de49 SHA-1: d4527af3fda7cbcca23294ddc7345a2e45e11c5b SHA-256: d940d1fdc41d86049fe469838459feef33c256d1d9677453e3c7c38d6da9f0f0
154 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier as malicious and contains a significant number of embedded links. One of these links, 'https://ttraff.ru/pify?keyword=playground+cad+blocks+free', points to a known malicious redirector. The document body, though heavily obfuscated, also contains this URL and other links hosted on benign platforms like Shopify, suggesting a link farm designed to obscure the ultimate malicious destination. The primary attack pattern involves luring users to malicious sites via these embedded links.

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=playground+cad+blocks+free
    • http://poxexeji.cheriselilynana.com/uploads/1/3/0/9/130969204/82c2c5f.pdf
    • http://sanigi.apanagopoulos.com/uploads/1/3/2/8/132815002/8852905.pdf
    • http://files.marshalltownmainstreet.org/uploads/1/3/1/8/131858045/jadidavumakafu.pdf
    • http://files.diasystem.se/uploads/1/3/0/7/130739227/6c7f4d16155.pdf
    • https://cdn.shopify.com/s/files/1/0431/5702/9019/files/tamafepiwisaduzaserowegus.pdf
    • https://cdn.shopify.com/s/files/1/0437/3318/8759/files/macam_gerak_tropisme.pdf
    • https://cdn.shopify.com/s/files/1/0428/4855/1068/files/jebokenezuduzisakeloxov.pdf
    • https://cdn.shopify.com/s/files/1/0436/2128/6050/files/wojaborapobarelo.pdf
    • https://cdn.shopify.com/s/files/1/0435/9513/7187/files/marilyn_manson_sweet_dreams_mp3.pdf
    • https://cdn.shopify.com/s/files/1/0437/0454/9531/files/ballistic_galvanometer_experiment_manual.pdf
    • https://cdn.shopify.com/s/files/1/0427/9359/9132/files/60058821318.pdf
    • https://cdn.shopify.com/s/files/1/0439/8556/7902/files/serious_adverse_event_form_in_clinical_trials.pdf
    • https://cdn.shopify.com/s/files/1/0434/8909/9938/files/the_foundations_of_empirical_knowledge.pdf
    • https://cdn.shopify.com/s/files/1/0436/9616/0921/files/65281272526.pdf
    • https://cdn.shopify.com/s/files/1/0429/7680/5023/files/chrome_android_block_cookies_from_specific_site.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_off0000447d.bin
a9a3f27540f57926e4ed3c1382a9f813265c4b2f4b15ff886c246ff521148129		 pdf-font-stream PDF embedded font (sfnt) at offset 0x447D 3548 bytes
font_01_sfnt_off00005135.bin
6755a1a9fd81086814537063922c46cabb9e19823984a6e87bd90f73a3b61536		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5135 5252 bytes
font_02_sfnt_off00006316.bin
7d0b0cfef02f326d17d9b5914a252c907c005d1573f7c0e479b6578eed57488f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6316 9584 bytes
font_03_sfnt_off000083cf.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83CF 4324 bytes

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