Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f7cc2d8e98e7c75…

MALICIOUS

PDF

38.9 KB Created: 2020-08-01 22:43:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9eaebce0e3d385d9bce1d91b22acc3e3 SHA-1: 9b921d96cada9016465d6754feba748f87081cae SHA-256: 8f7cc2d8e98e7c75e7f42d589283ce168188d158265b84182beb35a5af774e05
150 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, specifically pointing to 'https://ttraff.cc/wb?keyword=neuroplasticidade%20e%20autismo%20pdf'. This indicates the document's primary purpose is to redirect users to malicious infrastructure. The presence of a large number of external PDF links, many hosted on Shopify, further supports a link farm or SEO poisoning attack vector. 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/wb?keyword=neuroplasticidade%20e%20autismo%20pdf
    • http://files.dlfinancial.org/uploads/1/3/1/3/131379749/tobij.pdf
    • http://files.taniamcmurtry.com/uploads/1/3/1/3/131380841/74528.pdf
    • http://files.lifegivingcounsellingandtutoring.com/uploads/1/3/1/4/131437889/11fc1d145.pdf
    • https://cdn.shopify.com/s/files/1/0435/4765/6343/files/zutepobopakepe.pdf
    • https://cdn.shopify.com/s/files/1/0437/6123/8168/files/zakevaji.pdf
    • https://cdn.shopify.com/s/files/1/0430/6996/4439/files/ximudarunalizuboromoxiv.pdf
    • https://cdn.shopify.com/s/files/1/0432/6129/6790/files/vevuli.pdf
    • https://cdn.shopify.com/s/files/1/0434/7727/0692/files/69943675715.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/ximulomonarosaw.pdf
    • https://cdn.shopify.com/s/files/1/0428/2603/9463/files/24845388672.pdf
    • https://cdn.shopify.com/s/files/1/0435/3074/8055/files/wuvotapaduker.pdf
    • https://cdn.shopify.com/s/files/1/0437/3990/6209/files/rumufujejimometetugud.pdf
    • https://cdn.shopify.com/s/files/1/0434/6701/4297/files/xetotitovumijonoro.pdf
    • https://cdn.shopify.com/s/files/1/0434/9542/4165/files/31003003466.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_off00005618.bin
8ab5c3bc454aad9afb0e822efe7eafd8d993f5c84e3205757e1298144190dad7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5618 5268 bytes
font_01_sfnt_off000067ed.bin
c46260e25b09da5732f4757e975c6003d45017a56a61c0de51162dfb12727743		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67ED 12324 bytes

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