Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8ad85f6c422e27f…

MALICIOUS

PDF

41.3 KB Created: 2020-09-29 02:24:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2bda06dab594f120123b6e5817a6b6aa SHA-1: 191549c89190ba96c32ac99f514f29502dd096e7 SHA-256: e8ad85f6c422e27feaf68f839c89ad85752760379392aeada7d0d0bf64dfd199
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, identified by the PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM heuristics, which point to external PDF files. The primary link directs to a redirector URL, suggesting an attempt to obscure the final destination or to track clicks. The ML classifier also strongly indicated maliciousness. The document body itself is largely unreadable binary data, but the presence of the URL within it confirms its role as a lure.

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://gettraff.ru/mozel?keyword=aircraft+engineering+textbook+pdf
    • https://site-1037221.mozfiles.com/files/1037221/dakovixawuromexul.pdf
    • https://site-1036719.mozfiles.com/files/1036719/95798475687.pdf
    • https://site-1036722.mozfiles.com/files/1036722/zofedalu.pdf
    • https://site-1037129.mozfiles.com/files/1037129/vupiroz.pdf
    • http://files.gardenofchange.org/uploads/1/3/1/6/131606890/gerosavevelib_dekisegabez.pdf
    • http://jumasexop.molongshow.com/uploads/1/3/1/3/131379578/84ba848702aa9.pdf
    • http://files.dorebowen.com/uploads/1/3/1/6/131607174/3994866.pdf
    • http://files.allamericanarabians.com/uploads/1/3/2/7/132712040/gedebe-filano-punaxiru.pdf
    • http://files.yigroupslate.com/uploads/1/3/1/4/131407469/lajojomavaroruwogol.pdf
    • http://dutef.jaimafixsen.com/uploads/1/3/2/7/132710621/8024661.pdf
    • http://pomenufi.justkren.com/uploads/1/3/1/8/131856979/bipukuvafereli.pdf
    • https://d4fb44d5-96cd-452b-a1c5-8eb64adb766a.filesusr.com/ugd/cbe325_5dfb49fe844541819208b2179bafbdc3.pdf?index=true
    • https://e71a2459-b9f2-4e5c-8bf8-65f53bf4b7df.filesusr.com/ugd/6290de_7d7cc1e070894f45bc814b78c4021aa0.pdf?index=true
    • https://76749947-1d2e-4419-806e-bfb8c926e8d8.filesusr.com/ugd/ea9bdf_4c37977e4424445baef88274f54336f1.pdf?index=true
    • 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_off00006386.bin
90b03d3b634e8f504e09d4f8e2ccca0bacad020ddaef7cb1a2ffc00fb7d4cced
pdf-font-stream PDF embedded font (sfnt) at offset 0x6386 5376 bytes
font_01_sfnt_off000075e5.bin
6732e887c692492bbb76193a291b9c2f5a6ee90f819824f44ba078cbe5a033c2
pdf-font-stream PDF embedded font (sfnt) at offset 0x75E5 10128 bytes