Malicious PDF — malware analysis report

Static analysis result for SHA-256 104b4e5b313f5e81…

MALICIOUS

PDF

34.6 KB Created: 2020-08-16 22:59:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d127fbe20f52c7ea69789be20a5e468d SHA-1: e747f16886545e899700fcb23c93c32436445384 SHA-256: 104b4e5b313f5e8119af6dec193f3987388cdf5d77c0bea41f5f136dd564d6dc
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, indicating an attempt to lead the user to harmful content. The document body, though heavily obfuscated, contains URLs that are part of a link farm, suggesting a tactic to manipulate search engine results or distribute malicious content. The ML classifier strongly flagged this PDF as malicious.

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=large+fleur+de+lis+template
    • http://zemani.shortsaleapproved.org/uploads/1/3/1/3/131398406/8727394.pdf
    • http://files.drcathieenglish.com/uploads/1/3/1/4/131438501/be84597e0be3cc7.pdf
    • http://files.themultitudeexperience.com/uploads/1/3/1/8/131871424/89830c8aabbb50.pdf
    • http://files.dfholidays.com/uploads/1/3/1/4/131406337/navanulajobabel.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/3094/5693/files/18310141806.pdf
    • https://cdn.shopify.com/s/files/1/0438/1107/8301/files/85992361606.pdf
    • https://cdn.shopify.com/s/files/1/0438/3604/7525/files/fumamusunenexuvivaxodav.pdf
    • https://cdn.shopify.com/s/files/1/0432/4956/5853/files/bapafodapejefajolew.pdf
    • https://cdn.shopify.com/s/files/1/0439/1695/1704/files/kegogevuwizopisuropip.pdf
    • https://cdn.shopify.com/s/files/1/0432/7650/1147/files/liwisenoru.pdf
    • https://cdn.shopify.com/s/files/1/0433/2634/1272/files/14837959682.pdf
    • https://cdn.shopify.com/s/files/1/0436/5287/4390/files/12494747168.pdf
    • https://cdn.shopify.com/s/files/1/0450/1677/6868/files/25911951925.pdf
    • https://cdn.shopify.com/s/files/1/0434/5082/6919/files/tusodabamoxit.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_off000049df.bin
4d022a5b6b555a607948efa7cd101a79afba63238932e393f28c08a104d75aef
pdf-font-stream PDF embedded font (sfnt) at offset 0x49DF 5300 bytes
font_01_sfnt_off00005bcd.bin
dd9afe6c4999b8f89526a6e8586b55c0ecdc62b3ee5bd8b5422b81d5cad4b843
pdf-font-stream PDF embedded font (sfnt) at offset 0x5BCD 9900 bytes