Malicious PDF — malware analysis report

Static analysis result for SHA-256 73a34624b8c6338c…

MALICIOUS

PDF

48.7 KB Created: 2020-07-28 17:03:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 478574a567e9d8d88830e0cb22d7b6f6 SHA-1: d5d4f3e5feb9e2bbc6ba146c32c8cb6357dd85c0 SHA-256: 73a34624b8c6338cd30d48e3d93727e3bca6041d088576272e0ba1dc7b83a78c
154 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, with one identified as a malicious redirector. The document body, though heavily obfuscated, suggests a lure related to 'Cincinnati children's hospital clinical practice guidelines'. The presence of a link farm and a malicious redirector indicates an attempt to drive traffic to potentially harmful content, likely for phishing or malware distribution.

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=cincinnati+children%2527+s+hospital+clinical+practice+guidelines
    • http://files.peacefulseaproductions.com/uploads/1/3/0/8/130815014/rifezagovexun.pdf
    • http://files.seanarce.com/uploads/1/3/1/8/131856173/4ddd07eb0429c02.pdf
    • http://files.tipaldo3cs.com/uploads/1/3/1/8/131856290/637f2aa.pdf
    • http://files.pdxprays.com/uploads/1/3/1/3/131383018/wikixawasagi.pdf
    • http://files.jmccarthyphoto.com/uploads/1/3/2/6/132695629/zixewojasuse_rodexagagazus_dafiles_varakajolej.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0439/1786/9211/files/gifosovelafusexavew.pdf
    • https://cdn.shopify.com/s/files/1/0434/1514/2551/files/jivevomexelaresig.pdf
    • https://cdn.shopify.com/s/files/1/0434/5207/2086/files/rinutasobaxadobenizam.pdf
    • https://cdn.shopify.com/s/files/1/0435/6590/8136/files/49596621595.pdf
    • https://cdn.shopify.com/s/files/1/0430/0229/8521/files/56054141022.pdf
    • https://cdn.shopify.com/s/files/1/0434/5757/7122/files/desorakijiz.pdf
    • https://cdn.shopify.com/s/files/1/0434/2287/5797/files/febimekufelom.pdf
    • https://cdn.shopify.com/s/files/1/0429/2182/0313/files/35428756334.pdf
    • https://cdn.shopify.com/s/files/1/0438/1986/0125/files/kuzipulijawizaropimuriw.pdf
    • https://cdn.shopify.com/s/files/1/0432/2538/3073/files/777850194.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_off000070b8.bin
b010e1aab8d12e0414861e625830d24c4307827953936aff5827eda490e138ed
pdf-font-stream PDF embedded font (sfnt) at offset 0x70B8 5272 bytes
font_01_sfnt_off00008299.bin
6adf643452f477c41ed228f1ef28a95f941a6b78dc70a891980d6b848d668375
pdf-font-stream PDF embedded font (sfnt) at offset 0x8299 16196 bytes