Malicious PDF — malware analysis report

Static analysis result for SHA-256 25643e084380dc8a…

MALICIOUS

PDF

55.5 KB Created: 2020-07-26 04:53:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0f923a913e9bbc34dfedf09197fd916b SHA-1: 966e30d51653841985059ada8e1436eb061a4744 SHA-256: 25643e084380dc8a283fe99b76aad3b9bfa9c616aa90ea54b9a6fe402a511431
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains text related to a 'fishless cycle guide', likely a lure to entice users to click the malicious links. The primary attack pattern involves directing users to potentially harmful external sites.

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=fishless+cycle+guide
    • http://files.danpetersundland.com/uploads/1/3/1/8/131856827/lozimopibig.pdf
    • http://files.homepokeredge.com/uploads/1/3/0/8/130815381/1c0861.pdf
    • http://files.motortour.online/uploads/1/3/1/8/131856188/jotekikaxamumemut.pdf
    • https://cdn.shopify.com/s/files/1/0436/1378/2173/files/tapetajaguxewuzujo.pdf
    • https://cdn.shopify.com/s/files/1/0439/2534/0328/files/mozuduvifetikapuvipu.pdf
    • https://cdn.shopify.com/s/files/1/0437/3754/6917/files/sefodipo.pdf
    • https://cdn.shopify.com/s/files/1/0432/9956/9829/files/74611949724.pdf
    • https://cdn.shopify.com/s/files/1/0432/4950/0315/files/lobajolarutifabikoto.pdf
    • https://cdn.shopify.com/s/files/1/0432/5117/1478/files/90775520317.pdf
    • https://cdn.shopify.com/s/files/1/0435/7298/6015/files/zinejedin.pdf
    • https://cdn.shopify.com/s/files/1/0431/3595/9191/files/98911041556.pdf
    • https://cdn.shopify.com/s/files/1/0434/4646/8769/files/26439902950.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bumagigefabap.pdf
    • https://cdn.shopify.com/s/files/1/0435/5942/0063/files/sopevivemovenadileb.pdf
    • https://cdn.shopify.com/s/files/1/0435/5158/8507/files/lifavigijefubu.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009e2e.bin
101d1ee80bc1266fe9c90b7afe50a093f4ba8716d26a08adad535f450fcb7b90
pdf-font-stream PDF embedded font (sfnt) at offset 0x9E2E 4536 bytes
font_01_sfnt_off0000ada0.bin
f0d0138465e19820d1145fd99bc40a0bc6dd7b8dd30d3b48e19a18d19050d9d1
pdf-font-stream PDF embedded font (sfnt) at offset 0xADA0 10268 bytes