Malicious PDF — malware analysis report

Static analysis result for SHA-256 74c446b1ce414753…

MALICIOUS

PDF

46.1 KB Created: 2020-08-03 23:24:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b102c90327a1035ef1a8848001c80a84 SHA-1: 3ff7cc92ba150151e78be9de52808360cf00b830 SHA-256: 74c446b1ce4147533b4f72533152976465c87b6c54ecff5b7c25aa1f64ffd858
154 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, specifically identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The document body, though heavily obfuscated, contains a URL that appears to be part of a link farm designed to manipulate search engine results. The ML classifier also strongly indicated maliciousness.

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.com/pify?keyword=mathematics+education+books+pdf
    • http://files.aabilliardsupply.com/uploads/1/3/0/8/130874143/wimukasotulizesekaga.pdf
    • http://files.elizabethshanahan.com/uploads/1/3/1/4/131437299/9791419.pdf
    • http://files.gimliwaterfrontcentre.com/uploads/1/3/1/4/131454238/rexij.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/7228/2008/files/fujulav.pdf
    • https://cdn.shopify.com/s/files/1/0431/8684/7903/files/rijaladeni.pdf
    • https://cdn.shopify.com/s/files/1/0440/6122/9208/files/nhl_17_manual.pdf
    • https://cdn.shopify.com/s/files/1/0435/3848/1311/files/xetifewofozunukatotuke.pdf
    • https://cdn.shopify.com/s/files/1/0433/2270/4030/files/rurox.pdf
    • https://cdn.shopify.com/s/files/1/0428/2476/1507/files/25695320125.pdf
    • https://cdn.shopify.com/s/files/1/0432/6513/0660/files/pememuxi.pdf
    • https://cdn.shopify.com/s/files/1/0427/5827/5238/files/24517628489.pdf
    • https://cdn.shopify.com/s/files/1/0433/8935/4142/files/16911155030.pdf
    • https://cdn.shopify.com/s/files/1/0428/7689/5398/files/wujisaliraf.pdf
    • https://cdn.shopify.com/s/files/1/0437/1149/6347/files/muxosazetule.pdf
    • https://cdn.shopify.com/s/files/1/0438/1189/7504/files/jumusisizoloda.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_off00007349.bin
9d5667e58f9fbc4a708c38c96d8dc8e8cd886835be10833d1ab89dcb6c81bce9
pdf-font-stream PDF embedded font (sfnt) at offset 0x7349 5476 bytes
font_01_sfnt_off000085d0.bin
97ff41764ae53984a14f2a69ba63b91f963f34f4bb88cf2b69f20e3004fadfc7
pdf-font-stream PDF embedded font (sfnt) at offset 0x85D0 10564 bytes