Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c447aa918886905…

MALICIOUS

PDF

40.3 KB Created: 2020-08-12 18:40:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7f0ba8e8acf4701ce50455bfec7b28d7 SHA-1: 470aeb509f0f9b3e39bfa6db711301dfd285861d SHA-256: 5c447aa9188869059aaf47bdab4a2331b17b1857d16f4763907845917ec3826c
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO manipulation tactic. One prominent link, 'https://ttraff.cc/pify?keyword=business+administration+and+management+courses+pdf', is identified as a malicious redirector. This indicates the document's primary purpose is to redirect users to malicious infrastructure, likely for further exploitation or phishing. No scripts were extracted, but the PDF structure and embedded links are sufficient to infer malicious intent.

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/pify?keyword=business+administration+and+management+courses+pdf
    • http://files.wellsburgchamber.com/uploads/1/3/0/7/130740438/nanav.pdf
    • http://files.dbdfilmservices.com/uploads/1/3/1/3/131379312/4146486.pdf
    • http://files.hardwickwinery.com/uploads/1/3/0/8/130813667/9232181.pdf
    • http://files.spectrumdoula.com/uploads/1/3/1/6/131606890/4994060.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/0949/7496/files/9381952098.pdf
    • https://cdn.shopify.com/s/files/1/0438/4777/8469/files/zanusom.pdf
    • https://cdn.shopify.com/s/files/1/0445/4537/6420/files/annotated_outline_example.pdf
    • https://cdn.shopify.com/s/files/1/0434/0314/9477/files/4749016451.pdf
    • https://cdn.shopify.com/s/files/1/0435/6420/4193/files/ruvodixukidajap.pdf
    • https://cdn.shopify.com/s/files/1/0428/7230/7875/files/jebawirazunaxedoro.pdf
    • https://cdn.shopify.com/s/files/1/0428/8859/3567/files/68322335011.pdf
    • https://cdn.shopify.com/s/files/1/0435/3772/7637/files/gatokug.pdf
    • https://cdn.shopify.com/s/files/1/0441/2728/9496/files/51172604438.pdf
    • https://cdn.shopify.com/s/files/1/0429/9931/6639/files/29309162437.pdf
    • https://cdn.shopify.com/s/files/1/0432/1722/3847/files/stayed_prayed_up.pdf
    • https://cdn.shopify.com/s/files/1/0432/6352/5026/files/present_simple_and_present_continuous_worksheets_with_answers.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_off00005fe2.bin
12c4c18e1383fb4b89fc9a119845e352e6a4ce05e927191331f2b2c338132db7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FE2 5492 bytes
font_01_sfnt_off00007277.bin
f0554d84572a7a5d86bb47368c57d4e847a55967e725acea86df845c68c80701		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7277 9788 bytes

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