Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f1dc6da035d3b17…

MALICIOUS

PDF

39.4 KB Created: 2020-08-26 20:22:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 35175db67f4696bd5f6f1ea296cd7873 SHA-1: 273fc7d787c595e13f8427fe8c3f33f22d7698a3 SHA-256: 2f1dc6da035d3b176bc16b885ec28ce0eafe1314efa2787a2e6f9679e76b1a67
152 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 numerous embedded links. One critical heuristic indicates the presence of a PDF link to known malicious redirector infrastructure, specifically 'ttraff.ru'. Another critical heuristic identified a PDF link farm, with many links pointing to shopify.com domains, suggesting an attempt to obscure the final malicious destination. The document body contains the URL 'https://ttraff.ru/pify?keyword=surface+area+of+a+cyclinder' and a link to 'somerurunem.pdf' on shopify.com, reinforcing the redirection and link farm findings.

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=surface+area+of+a+cyclinder
    • http://files.conservationtales.com/uploads/1/3/2/8/132814306/3385757.pdf
    • http://poledele.milesformoms5k.org/uploads/1/3/1/4/131406686/nofewenewexozoxujini.pdf
    • http://files.bwaltonwrites.com/uploads/1/3/0/7/130776599/8371195.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/somerurunem.pdf
    • https://cdn.shopify.com/s/files/1/0434/8795/3053/files/ncert_class_7_science_notes.pdf
    • https://cdn.shopify.com/s/files/1/0431/5915/8940/files/ariens_11528le_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/8900/1638/files/mojukiruzel.pdf
    • https://cdn.shopify.com/s/files/1/0434/1415/9521/files/fetogipibuko.pdf
    • https://cdn.shopify.com/s/files/1/0431/4903/3627/files/ppsspp_gold_pc_full.pdf
    • https://cdn.shopify.com/s/files/1/0459/8824/9757/files/california_performing_arts_theatre_san_bernardino_ca.pdf
    • https://cdn.shopify.com/s/files/1/0430/9244/3303/files/advanced_reading_comprehension_test_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0433/3728/5797/files/lesajesizunamit.pdf
    • https://cdn.shopify.com/s/files/1/0432/3786/7687/files/greater_soul_gem.pdf
    • https://cdn.shopify.com/s/files/1/0432/0765/5579/files/acura_tl_awd_manual_transmission_for_sale.pdf
    • https://cdn.shopify.com/s/files/1/0438/0668/7394/files/twitter_videos_on_mobile.pdf
    • https://cdn.shopify.com/s/files/1/0433/2063/9646/files/solawapofinepumiwep.pdf
    • https://cdn.shopify.com/s/files/1/0431/3081/4626/files/83069444831.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_off00005dfa.bin
55fa0028d901a9f62dc4b7ced3f230b2b57bff0bbbbb003bbceaf089c7c6b68f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DFA 5040 bytes
font_01_sfnt_off00006f2b.bin
6e901e317d89371dc4b5ce9493789f7414d67e053afbceb4c8d1b122495de0ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F2B 9748 bytes

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