Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed7b663653f008fc…

MALICIOUS

PDF

59.0 KB Created: 2020-08-30 20:20:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0015bc88b7f7bef647133d8156ef9fe2 SHA-1: 7db26d7fcbdf6583ca6b7108391612a7b2abfb43 SHA-256: ed7b663653f008fce0cc6b6eef062ec37656ba2c47c4bcab5ac0dbfa66ee8e15
150 Risk Score

Malware Insights

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

The PDF contains a mass of external links, including a critical link to a known malicious redirector at `https://ttraff.cc/wix?keyword=avalia%25C3%25A7%25C3%25A3o+diagn%25C3%25B3stica+de+matem%25C3%25A1tica+para+3+ano+do+ensino+fundamental`. This URL is presented within the document body disguised as a diagnostic math test for young students, indicating a social engineering lure. The ML classifier also strongly flagged this PDF as malicious.

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.cc/wix?keyword=avalia%25C3%25A7%25C3%25A3o+diagn%25C3%25B3stica+de+matem%25C3%25A1tica+para+3+ano+do+ensino+fundamental
    • https://static.usrfiles.com/ugd/8d57bd_d34b59165c6a4658a8cd3ed71fc624d8.pdf
    • https://static.usrfiles.com/ugd/aff7ca_a6569f7be59f43379febc440ac7acd52.pdf
    • https://static.usrfiles.com/ugd/067ecb_194a5f302d854eb99d3f401c940a8004.pdf
    • https://cdn.shopify.com/s/files/1/0431/2498/1921/files/katasesorupafajisexubuj.pdf
    • https://cdn.shopify.com/s/files/1/0433/4823/0297/files/sadopovimuzisinus.pdf
    • https://cdn.shopify.com/s/files/1/0434/7871/2472/files/masitelixewox.pdf
    • https://cdn.shopify.com/s/files/1/0433/6871/0309/files/36002063750.pdf
    • https://cdn.shopify.com/s/files/1/0435/4444/5092/files/2868962586.pdf
    • https://cdn.shopify.com/s/files/1/0435/4434/6792/files/11447175147.pdf
    • https://cdn.shopify.com/s/files/1/0432/6722/7811/files/bihar_tet_2011_question_paper_with_answer.pdf
    • https://cdn.shopify.com/s/files/1/0429/6232/1567/files/demed.pdf
    • https://cdn.shopify.com/s/files/1/0434/5276/0224/files/todawajijimudonig.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_off00009f9e.bin
05ed1bf250c96857d1bfc586155f4d34b2dfd401300dd3ad158a7eca3c9cbf78		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9F9E 6560 bytes
font_01_sfnt_off0000b422.bin
d95631ec4ac11dc3dbece45ea7428aca39591e731d3db8a2482e8b48e6f47d32		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB422 13056 bytes

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