Malicious PDF — malware analysis report

Static analysis result for SHA-256 2592e45e3a1c5e3b…

MALICIOUS

PDF

47.5 KB Created: 2020-07-24 06:16:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 32fab039a321b363a9cd98884fbb8ba0 SHA-1: 98ef8ff13aa70280228d90a2eabe808cad3e021c SHA-256: 2592e45e3a1c5e3bc0d6f06d7c771d99eb38557a836db3e9c6b2b6d35be77932
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/wb?keyword=reading%20strategies%20for%20elementary%20pdf'. Additionally, another critical heuristic indicates a PDF link farm, with the first URL being 'https://cdn.shopify.com/s/files/1/0431/9281/1681/files/33398584955.pdf'. The ML classifier also strongly flagged this PDF as malicious. The document body appears to be obfuscated or corrupted, but the presence of these malicious links strongly suggests a phishing or redirection attack.

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.cc/wb?keyword=reading%20strategies%20for%20elementary%20pdf
    • http://files.tomefrost.com/uploads/1/3/1/4/131438207/9257218.pdf
    • http://files.apexdrama.com/uploads/1/3/0/7/130776591/d2e48c.pdf
    • http://files.australianworkingadventures.com/uploads/1/3/2/8/132814906/negugedaroza-nezowake-susezupobadiro.pdf
    • http://files.the4goforth.com/uploads/1/3/1/1/131163780/pekoj.pdf
    • https://cdn.shopify.com/s/files/1/0431/9281/1681/files/33398584955.pdf
    • https://cdn.shopify.com/s/files/1/0437/6988/8920/files/4598269154.pdf
    • https://cdn.shopify.com/s/files/1/0433/9515/4070/files/tupekati.pdf
    • https://cdn.shopify.com/s/files/1/0433/6707/1894/files/larosirewagesabezewure.pdf
    • https://cdn.shopify.com/s/files/1/0429/7539/5993/files/29080044510.pdf
    • https://cdn.shopify.com/s/files/1/0431/4457/7178/files/tujufalotakofodomifekame.pdf
    • https://cdn.shopify.com/s/files/1/0431/8704/4510/files/faposopozaxesakeputov.pdf
    • https://cdn.shopify.com/s/files/1/0431/7092/2652/files/nalemojofamuf.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/88406012193.pdf
    • https://cdn.shopify.com/s/files/1/0438/7235/4459/files/37121648397.pdf
    • https://cdn.shopify.com/s/files/1/0431/7881/9735/files/66232737007.pdf
    • https://cdn.shopify.com/s/files/1/0435/3936/6047/files/68315773955.pdf
    • https://cdn.shopify.com/s/files/1/0433/9610/4348/files/67870897620.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/1/0433/6707/1894/files/larosirewagesabezewure

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007c7c.bin
769a422effcb747f868e5db4695f52a6c22b5e474cde8dc0063d0e99acb7c6e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C7C 5260 bytes
font_01_sfnt_off00008e50.bin
2f1b8d9a539acee7eadcaf0c9a90b4b9d75690781878b27ac7ecaeea532a930f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E50 10128 bytes

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