Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2771b9168d65072…

MALICIOUS

PDF

48.6 KB Created: 2020-08-27 16:23:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 97a8542f930940ff77d6530df51a0f18 SHA-1: eeb08dc0e4ac4286c1587ee62435ef7361d50328 SHA-256: d2771b9168d65072d54e67b5bba2c8eb82d7e6fabec41f9a93c19da05e26d14d
150 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, which is disguised as an academic exercise. The document body itself is heavily obfuscated, but the presence of the malicious URL and the PDF_MALICIOUS_REDIRECTOR_LINK heuristic strongly indicate a phishing attempt. The PDF_SEO_LINK_FARM heuristic suggests a large number of similar PDFs are being generated to distribute this 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.com/pify?keyword=exercice+loi+d%2527+ohm+3%25C3%25A8me+pdf
    • http://bofagiwe.goodspeedwatches.com/uploads/1/3/0/8/130814328/ed8586a1.pdf
    • http://files.sfachapterfootball.com/uploads/1/3/1/4/131453036/42e572c8bc1.pdf
    • http://files.mrbsfinest.com/uploads/1/3/2/3/132303080/wozesepivijiwox.pdf
    • http://files.jamiekincaid.com/uploads/1/3/1/4/131409717/1a7a3.pdf
    • http://dozadi.toppinggeography.com/uploads/1/3/2/8/132815148/4458132.pdf
    • https://cdn.shopify.com/s/files/1/0431/3012/6496/files/29646076884.pdf
    • https://cdn.shopify.com/s/files/1/0431/8068/7524/files/percent_error_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0435/7016/7967/files/national_building_cost_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/2936/4889/files/doditalagemebuf.pdf
    • https://cdn.shopify.com/s/files/1/0437/8063/6821/files/movodepulonoxusunem.pdf
    • https://cdn.shopify.com/s/files/1/0437/6264/7189/files/80868748617.pdf
    • https://cdn.shopify.com/s/files/1/0434/4319/1969/files/mutosafivibubuvetul.pdf
    • https://cdn.shopify.com/s/files/1/0439/5322/5886/files/dulotesel.pdf
    • https://cdn.shopify.com/s/files/1/0430/8303/8874/files/47628786933.pdf
    • https://cdn.shopify.com/s/files/1/0430/7078/3645/files/sesofomowupiboxiteme.pdf
    • https://cdn.shopify.com/s/files/1/0438/0409/8722/files/71179529758.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_off00007964.bin
cbf7ef4260f983a90ffa3db52f9acb5e1a5d74916d2a9168415769106ed54ec8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7964 5372 bytes
font_01_sfnt_off00008b51.bin
e3a96e180459404df54b102af27bece238d46cf7fc68f07e839b3eebf769f825		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B51 12452 bytes

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