Malicious PDF — malware analysis report

Static analysis result for SHA-256 652252cc5a747f19…

MALICIOUS

PDF

40.4 KB Created: 2020-09-14 02:52:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 149b725d0f3ccc70cb0a5c657ff9f68f SHA-1: 6eb4aa0bd843a75ba3165d14e05c258c564e03f3 SHA-256: 652252cc5a747f19e3d455ba0ccf661cd74f6d61ca9961271c49131de4798d87
154 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to a known malicious redirector. The document body, though partially obfuscated, contains text suggesting a lure for 'study guide answers' which, when clicked, leads to the malicious URL. The ML classifier strongly supports the malicious verdict.

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.link/wix?keyword=nothing+but+the+truth+study+guide+answers
    • http://files.librarylessonsandlearning.com/uploads/1/3/1/4/131409037/lozejozejanodunu.pdf
    • http://files.esulix.com/uploads/1/3/1/8/131857419/zetamukajem.pdf
    • http://files.esjohnson.com/uploads/1/3/1/3/131380342/cf2558f25a93.pdf
    • http://files.booksbyart.com/uploads/1/3/1/3/131378988/niburuxetimo-xedise-dokalokufoxidux-sinitik.pdf
    • http://dawowuk.silkroadvirtualuniversity.org/uploads/1/3/1/3/131398140/worawogogezivuv_topes.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/8b4172_ef33b1215f9c47319a2eca289f767248.pdf
    • https://static.usrfiles.com/ugd/b58d21_31dc05f91896402e8c51a0d2fb0ce805.pdf
    • https://static.usrfiles.com/ugd/278743_f0896d90c47347fcb271b9f4b696dca7.pdf
    • https://static.usrfiles.com/ugd/2f3216_959da283433246cd84293353e8f0b69d.pdf
    • https://static.usrfiles.com/ugd/13ae68_04137328b115493dbd6c3b813df90200.pdf
    • https://cdn.shopify.com/s/files/1/0433/0615/6190/files/66130800726.pdf
    • https://cdn.shopify.com/s/files/1/0437/2230/9786/files/nigabonewipirijuzida.pdf
    • https://cdn.shopify.com/s/files/1/0430/2045/1997/files/76051349504.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_off00006064.bin
ce965538edf03949307af3af5577883191a3997355c2f57ac2ea001fee75d760
pdf-font-stream PDF embedded font (sfnt) at offset 0x6064 5356 bytes
font_01_sfnt_off000072aa.bin
135cdf49c5f4deb324e057cb6fba3df012e0406c803fbd28868a660b7e4579ca
pdf-font-stream PDF embedded font (sfnt) at offset 0x72AA 9892 bytes