Malicious PDF — malware analysis report

Static analysis result for SHA-256 a156dd8ba8e6d0b5…

MALICIOUS

PDF

42.1 KB Created: 2020-08-24 14:39:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9f9fa2665441ee35062e688fb72d9f4e SHA-1: 6ceb67f6893c5d01acc2a257527f431b6b1ea34d SHA-256: a156dd8ba8e6d0b51a4dbd479b09d56c28d53b63639832c941a9a206f9b5beda
150 Risk Score

Malware Insights

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

The PDF file exhibits characteristics of an SEO link farm, with numerous embedded links pointing to external PDF files. The primary malicious indicator is a link to `ttraff.ru`, which is identified as a known malicious redirector. The ML classifier also strongly flagged this PDF as malicious. The document body contains the URL `https://ttraff.ru/pify?keyword=answer+club+regulamin` and several Shopify URLs, consistent with the link farm heuristic.

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=answer+club+regulamin
    • http://jumotet.wirelessadvocatesonline.com/uploads/1/3/0/7/130775826/diteg.pdf
    • https://cdn.shopify.com/s/files/1/0429/4439/7468/files/45862072848.pdf
    • https://cdn.shopify.com/s/files/1/0430/7438/8119/files/84074652585.pdf
    • https://cdn.shopify.com/s/files/1/0434/1399/5672/files/abb_robot_programming_manual.pdf
    • https://cdn.shopify.com/s/files/1/0428/2312/3100/files/82729637439.pdf
    • https://cdn.shopify.com/s/files/1/0437/1965/5579/files/irs_enrolled_agent_exam_study_guide.pdf
    • https://cdn.shopify.com/s/files/1/0431/0715/6128/files/24859069183.pdf
    • https://cdn.shopify.com/s/files/1/0432/4071/8493/files/nanulenebodulikexifudopog.pdf
    • https://cdn.shopify.com/s/files/1/0434/0252/6872/files/17804114616.pdf
    • https://cdn.shopify.com/s/files/1/0434/6337/7048/files/ajax_call_php.pdf
    • https://cdn.shopify.com/s/files/1/0441/0241/8584/files/36792256447.pdf
    • https://cdn.shopify.com/s/files/1/0431/1243/1776/files/25590477003.pdf
    • https://cdn.shopify.com/s/files/1/0429/6943/2230/files/bizotulazapetalemeb.pdf
    • https://cdn.shopify.com/s/files/1/0433/9505/5777/files/pisodaj.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/
    • https://cdn.shopify.com/s/files/1/0433/9505/5777/f

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000063ed.bin
439f473b81a3f5e5276decec54eb8dcb3ba62a55afbf593c0135efeeb704e097		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63ED 5340 bytes
font_01_sfnt_off00007609.bin
0caaf8c41f012b4039ba41e8b71b8db16e570b2c2b7cdf84ee057e5aaff8cf6e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7609 10536 bytes

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