Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ff7b22d11e44bda…

MALICIOUS

PDF

48.5 KB Created: 2020-09-30 18:48:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f98df895032c200c9e83800c494c96b5 SHA-1: 5b31cb2ebea53ba2c8674926275d135575cfe136 SHA-256: 2ff7b22d11e44bda0e56e9a8ba3eb9f67a15893068819fc2a39634a7d0019bae
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to domains associated with link farms and redirectors. One critical heuristic identified a link to known malicious redirector infrastructure. The document body itself contains obfuscated text and URLs, including a specific redirector URL, suggesting an attempt to disguise malicious links. The primary goal appears to be directing users to external, potentially malicious, websites.

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://cctraff.ru/mozel?keyword=bescherelle+d%2527+orthographe+pdf
    • http://files.mfmetalarts.com/uploads/1/3/2/7/132740564/bubinel.pdf
    • http://nijage.englishinisrael.com/uploads/1/3/0/9/130969422/8336051.pdf
    • http://vuwidol.nationalsenate.net/uploads/1/3/0/8/130874523/kejamo.pdf
    • http://kedezimu.effective-educators.net/uploads/1/3/2/3/132302984/8258939.pdf
    • http://files.kudratforever.com/uploads/1/3/0/8/130814980/8b18e321a5c21.pdf
    • http://worif.havenartistry.com/uploads/1/3/0/8/130813961/86db93473788f.pdf
    • http://waten.janemasur.com/uploads/1/3/0/7/130739845/sekovobajimata.pdf
    • http://files.coloradoaps.com/uploads/1/3/0/7/130740249/165141.pdf
    • http://files.sthelens-acupuncture.co.uk/uploads/1/3/1/0/131070001/496499.pdf
    • http://kibagi.popgalleryorlando.com/uploads/1/3/0/7/130740019/3868233.pdf
    • http://files.sophiebehal.com/uploads/1/3/0/7/130740464/97873ee4434e96b.pdf
    • http://kologa.kellysternyoga.com/uploads/1/3/1/4/131410158/757279bf.pdf
    • https://site-1036824.mozfiles.com/files/1036824/xifijelobovorimogeramoj.pdf
    • https://site-1037156.mozfiles.com/files/1037156/bosalofu.pdf
    • https://site-1036692.mozfiles.com/files/1036692/ginoxo.pdf
    • https://site-1036951.mozfiles.com/files/1036951/62842563544.pdf
    • https://site-1037114.mozfiles.com/files/1037114/6577457744.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006c1c.bin
437bc0e7c27b00cae20e02cd52980f456413471975b5585a8a52e188a51ba4a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C1C 5132 bytes
font_01_sfnt_off00007daf.bin
e0744e9de28d74f5274fa14af7ef4799d2011ec1bd9f3ecd6ae91450cb7642fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DAF 12404 bytes
font_02_sfnt_off0000a4ec.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA4EC 4324 bytes

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