Malicious PDF — malware analysis report

Static analysis result for SHA-256 b155765076493007…

MALICIOUS

PDF

45.5 KB Created: 2020-08-04 18:11:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7544ec2208e8735020126c948ce00432 SHA-1: fda4536b5a922e9866e1d48706fb51adff315f19 SHA-256: b1557650764930076754ee905290f1d3cbca9a950a755950341f3bbec2e22147
120 Risk Score

Malware Insights

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

The PDF file contains a link farm designed to appear as legitimate PDF downloads for textbooks. The primary link, 'https://ttraff.ru/pify?keyword=neural+networks+and+deep+learning+a+textbook+aggarwal+pdf+download', is flagged as a malicious redirector. This indicates a social engineering tactic to lure users to potentially harmful content. The file's structure and embedded links suggest a phishing or malware distribution attempt.

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=neural+networks+and+deep+learning+a+textbook+aggarwal+pdf+download
    • http://files.keikomiyazaki.com/uploads/1/3/1/4/131409755/3193108.pdf
    • http://files.barriobikeshop.com/uploads/1/3/1/4/131454190/libuxelaregiro.pdf
    • http://files.willowfree.ca/uploads/1/3/0/7/130740344/xiwodufa.pdf
    • https://cdn.shopify.com/s/files/1/0428/1715/9335/files/65610369062.pdf
    • https://cdn.shopify.com/s/files/1/0430/7389/6602/files/xijesilewuzejokodifonadiz.pdf
    • https://cdn.shopify.com/s/files/1/0433/5609/4614/files/kuxatimuxepow.pdf
    • https://cdn.shopify.com/s/files/1/0428/8030/3270/files/60762772406.pdf
    • https://cdn.shopify.com/s/files/1/0429/5173/7498/files/dbt_skills_training_manual_free.pdf
    • https://cdn.shopify.com/s/files/1/0428/9619/5737/files/jaxelim.pdf
    • https://cdn.shopify.com/s/files/1/0434/1648/6040/files/21467398227.pdf
    • https://cdn.shopify.com/s/files/1/0434/6406/5190/files/ccna_200_125_free.pdf
    • https://cdn.shopify.com/s/files/1/0437/1628/0475/files/timuxabivugemexipeg.pdf
    • https://cdn.shopify.com/s/files/1/0436/7689/3334/files/56062889300.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/23313492251.pdf
    • https://cdn.shopify.com/s/files/1/0431/2799/6565/files/63061736653.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_off00007221.bin
40efda6a462bc3e1ef27179c1291e5fc591e0882d7f83571637a094eb6f79fbf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7221 5544 bytes
font_01_sfnt_off0000852b.bin
abfcc5bdcbced6c7ced5562c81589ff7c76ac4cfd4fc847aec7e09bd75943264		 pdf-font-stream PDF embedded font (sfnt) at offset 0x852B 10416 bytes

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