Malicious PDF — malware analysis report

Static analysis result for SHA-256 556b4d3fb4c6f41c…

MALICIOUS

PDF

40.6 KB Created: 2020-08-20 13:46:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a13fccf8846f2db9cb19ec8af90cf5d0 SHA-1: f323aa2c75b33cc944a3c6193ba137665131354a SHA-256: 556b4d3fb4c6f41cbd3cf7419e48e074cae0dc73ec0bf998786938fd8e3829df
150 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many pointing to Shopify domains, but one critical link to 'ttraff.ru' is identified as a malicious redirector. The document body, though heavily obfuscated, contains the search term 'organic linen sheets canada' and the malicious URL, suggesting a phishing lure designed to trick users into clicking through to potentially malicious content. No scripts were extracted, but the PDF structure itself is used to host and distribute the malicious link.

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.ru/pify?keyword=organic+linen+sheets+canada
    • http://lagej.margesonsclass.com/uploads/1/3/1/4/131437605/1203984.pdf
    • https://cdn.shopify.com/s/files/1/0430/6622/8898/files/25441150222.pdf
    • https://cdn.shopify.com/s/files/1/0429/9587/6003/files/lelutadavaxafekova.pdf
    • https://cdn.shopify.com/s/files/1/0438/6032/8608/files/79571590633.pdf
    • https://cdn.shopify.com/s/files/1/0430/6495/0946/files/zubaxugosapi.pdf
    • https://cdn.shopify.com/s/files/1/0429/8362/0757/files/dumenabinilafedujosime.pdf
    • https://cdn.shopify.com/s/files/1/0434/0894/9402/files/wow_first_aid_removed.pdf
    • https://cdn.shopify.com/s/files/1/0428/0880/3495/files/lokikazekavinufinuda.pdf
    • https://cdn.shopify.com/s/files/1/0434/5282/5767/files/a_game_of_thrones_audiobook.pdf
    • https://cdn.shopify.com/s/files/1/0431/4411/8434/files/85052746284.pdf
    • https://cdn.shopify.com/s/files/1/0429/3902/3526/files/12949735912.pdf
    • https://cdn.shopify.com/s/files/1/0429/5114/7676/files/assessing_meaning.pdf
    • https://cdn.shopify.com/s/files/1/0430/1740/4573/files/78011764566.pdf
    • https://cdn.shopify.com/s/files/1/0427/3196/2535/files/vagepuwu.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_off00006105.bin
7dead88047a1e11b4d7fbb40eecca9590a16adbe1e56639a3c6e77c685c0e2aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6105 5228 bytes
font_01_sfnt_off000072bc.bin
29b9c82bbf673b42e792cb15a9f9831c451eb09dc43bc272b2e689aa09674def		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72BC 10316 bytes

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