Malicious PDF — malware analysis report

Static analysis result for SHA-256 066344ee72b18f97…

MALICIOUS

PDF

44.0 KB Created: 2020-08-31 08:28:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2aec0a529009b2494d4db17173dac9d1 SHA-1: 2d10b74e5c803fcd3b5e9e07e39f1ac0391a5ef5 SHA-256: 066344ee72b18f97c0d060383c7a829c81dbde0eaa90c551ea33e597069208d6
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links, one of which, https://ttraff.cc/wix?keyword=sample+reference+letter+for+child+care+worker, is flagged as a malicious redirector. The document body, though heavily obfuscated, contains text related to a 'sample reference letter for child care worker' and also includes the malicious URL, suggesting a phishing or malware delivery attempt. The presence of numerous other links to Shopify-hosted PDFs indicates a link farm strategy, likely to obscure the malicious destination.

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/wix?keyword=sample+reference+letter+for+child+care+worker
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0462/5393/2698/files/everyday_science_mcqs_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0430/5738/1530/files/38158004444.pdf
    • https://cdn.shopify.com/s/files/1/0437/1424/8857/files/89109737685.pdf
    • https://cdn.shopify.com/s/files/1/0431/7727/9652/files/organizational_change_management.pdf
    • https://static.usrfiles.com/ugd/36f25b_1bf480f84c9241c4bb3e1ca9cbf63057.pdf
    • https://static.usrfiles.com/ugd/67e251_94ba11a2cec4452f803039fb9168b30b.pdf
    • https://static.usrfiles.com/ugd/fd7405_d1a1eaea45294e93bf0d80ad5874fdc5.pdf
    • https://static.usrfiles.com/ugd/1f6d71_3ff9f5b977b24b75901a05f0b211c6b2.pdf
    • https://static.usrfiles.com/ugd/20d83a_1a76689dba084d5d9b775e5bbf032847.pdf
    • https://static.usrfiles.com/ugd/906e9f_3e9c820d093a450ba4ef8f1d8290a4c7.pdf
    • https://static.usrfiles.com/ugd/b8c837_6a08c401915e4bd18991ef63afac1668.pdf
    • https://static.usrfiles.com/ugd/58a813_97db8c9ecc954088bb377665d4a37217.pdf
    • https://static.usrfiles.com/ugd/529dbf_6bb286ea39824f319160f774ee60aca5.pdf
    • https://static.usrfiles.com/ugd/a2d007_08164d85586240d880a22b301ad29f19.pdf
    • https://static.usrfiles.com/ugd/b27199_8cf70417d7b54c5ba42898f6f4bd66b6.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006eb1.bin
9c9d5efecaa176d0fa4c2b1d830df43e3e34db551d74ec2a48e56141e497d8fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EB1 5476 bytes
font_01_sfnt_off0000812a.bin
4e8a35b38561b5f2b4da1110202e703992f319257110ba15cafc78bcea5294b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x812A 9944 bytes

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