Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cb0110bf689172d…

MALICIOUS

PDF

42.2 KB Created: 2020-08-21 00:23:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e774779edd54df277fbb2b673b2bcb07 SHA-1: 3bd35a21b41a5d109b6e98bb7ed4ffb8b8e8ed58 SHA-256: 7cb0110bf689172d614a40ce21f54310338c4b14b42ab67a95c7279d7cd3ff83
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a heuristic match for malicious redirector links, specifically pointing to 'https://ttraff.ru/pify?keyword=the+great+state+icivics+worksheet+answer+key'. It also exhibits characteristics of a link farm, embedding numerous links to other PDF documents, many hosted on Shopify. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains the same redirector URL.

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.ru/pify?keyword=the+great+state+icivics+worksheet+answer+key
    • http://files.nashvillephotographyclub.com/uploads/1/3/1/4/131437385/vorije.pdf
    • http://files.sandplumnaturetrail.com/uploads/1/3/0/7/130740389/fikababodij-fiwakes-zexanituze.pdf
    • http://files.richardberretttours.com/uploads/1/3/2/7/132740285/7688359.pdf
    • http://files.srrlsf.com/uploads/1/3/1/3/131380868/4f04903295aa5.pdf
    • http://files.beadart-austria.com/uploads/1/3/1/8/131871821/tabonopoparosulu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/8028/6372/files/forming_storming_norming_performing.pdf
    • https://cdn.shopify.com/s/files/1/0447/0718/4793/files/investment_analyst_interview_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tulajemo.pdf
    • https://cdn.shopify.com/s/files/1/0429/7703/4399/files/basic_concepts_of_electrical_engineering_ps_subramanyam_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/0182/2875/files/zuvofineniripolusaperom.pdf
    • https://cdn.shopify.com/s/files/1/0433/4852/5208/files/3928629245.pdf
    • https://cdn.shopify.com/s/files/1/0433/8837/1107/files/65107832025.pdf
    • https://cdn.shopify.com/s/files/1/0438/2280/9250/files/23766120625.pdf
    • https://cdn.shopify.com/s/files/1/0433/4256/1433/files/format_bmp_adalah.pdf
    • https://cdn.shopify.com/s/files/1/0428/5313/8591/files/bulefazivefitawi.pdf
    • https://cdn.shopify.com/s/files/1/0431/0990/8642/files/61671208853.pdf
    • https://cdn.shopify.com/s/files/1/0438/7084/7131/files/what_are_the_barriers_of_effective_communication.pdf
    • https://cdn.shopify.com/s/files/1/0440/4235/4853/files/17884890826.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/62114329075.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_off000066f7.bin
f992d6e01137f1166668f8590df5c8532149194c493f61c470da4b1db749f186		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66F7 5296 bytes
font_01_sfnt_off00007914.bin
bc6ee61b52b56faf6fdfaf1e1d5aa75f397845e92510c2c1375002308188d5c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7914 10008 bytes

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