Malicious PDF — malware analysis report

Static analysis result for SHA-256 75fd71ac54687e9b…

MALICIOUS

PDF

41.0 KB Created: 2020-08-27 23:41:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4789edcb31821023ac9519ab70f22d01 SHA-1: 53f21a303dcda0d81a069bdcb76f422f142b3d3b SHA-256: 75fd71ac54687e9bf7eeee73a420de5089d133fcbedb660689ee6efcd9cc3f27
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a mass external link farm, with a primary URL pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the title 'Sopa de letras de informatica con 20' and the malicious URL, suggesting a lure to a phishing or malware distribution site. The presence of numerous Shopify-hosted PDF links, while some are benign, indicates a strategy to obscure the malicious destination. No scripts were extracted, but the PDF structure and embedded links strongly suggest a social engineering attack.

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.club/pify?keyword=sopa+de+letras+de+informatica+con+20
    • http://files.kimlista.com/uploads/1/3/0/8/130815228/ae3b6340795a.pdf
    • http://files.sepcal.online/uploads/1/3/1/1/131164081/3236618.pdf
    • http://files.sugarrimbar.com/uploads/1/3/2/7/132710791/bifimejetezofitufaf.pdf
    • http://files.nicolloabe.com/uploads/1/3/1/3/131379406/vujikawibij_tulefoto.pdf
    • https://cdn.shopify.com/s/files/1/0432/0083/9842/files/38626353570.pdf
    • https://cdn.shopify.com/s/files/1/0430/9463/8749/files/81134194173.pdf
    • https://cdn.shopify.com/s/files/1/0440/5706/7685/files/32148391890.pdf
    • https://cdn.shopify.com/s/files/1/0435/3599/0943/files/deep_learning_algorithms.pdf
    • https://cdn.shopify.com/s/files/1/0432/4301/2256/files/applied_linguistics_to_foreign_language_teaching_and_learning.pdf
    • https://cdn.shopify.com/s/files/1/0429/5095/1066/files/3477655008.pdf
    • https://cdn.shopify.com/s/files/1/0434/1625/6677/files/lekufatutelepovune.pdf
    • https://cdn.shopify.com/s/files/1/0429/3502/5831/files/bakliwal_tutorials_entrance_exam_sample_papers.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_off000057eb.bin
6d1b8769545f1d3f9720b8ca180aa150a7e6b55c73d3e6676a68bb491a98fbd7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x57EB 5676 bytes
font_01_sfnt_off00006b21.bin
decd19177e53e875e2c97a7c01b072177dc4f30110a0422f0e2d36ef6ba1f2e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B21 13952 bytes

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