Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1de58476058ee07…

MALICIOUS

PDF

43.2 KB Created: 2020-10-02 08:42:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 1446e2c4a2224d144224a2cec79ed324 SHA-1: e3ec50db77027744e00de2f279ac1b27cd64aae1 SHA-256: f1de58476058ee07d579fc93dd989a3eefd7224de3c70f6fa8638e8098a9fe6d
94 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a malicious redirector link, pointing to 'https://ggtraff.ru/strik?keyword=the+complete+guide+to+the+toefl+test'. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to lure the user to a malicious site. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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://ggtraff.ru/strik?keyword=the+complete+guide+to+the+toefl+test In PDF document text
    • https://site-1036721.mozfiles.com/files/1036721/92871061055.pdfIn PDF document text
    • http://files.amberbellemusic.us/uploads/1/3/1/6/131606550/c84a184a1730a79.pdfIn PDF document text
    • http://foxaro.leia-wilson.com/uploads/1/3/2/6/132681268/625123.pdfIn PDF document text
    • https://site-1036760.mozfiles.com/files/1036760/1864688223.pdfIn PDF document text
    • https://site-1037283.mozfiles.com/files/1037283/jutiwatajokemulo.pdfIn PDF document text
    • https://site-1037214.mozfiles.com/files/1037214/47466597271.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/4482/1399/files/26433300577.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/3437/3027/files/46840848899.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/2452/6755/files/22599161970.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0000787c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x787C 22508 bytes
SHA-256: a3445ac874d29bef2c7019c56e52d3d7207ef4497c043af541d1ae713f5c39eb
font_00_sfnt_off000044b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x44B2 5212 bytes
SHA-256: f1ef510b1ad7286e0d85aec9c4ab213684ea8d71e226c23ae9def47103a9ae75
font_01_sfnt_off00005654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5654 9964 bytes
SHA-256: 1579e455cb996d4ef80a3f45634b92b7559f001ad7e0413a57f8cdd1075d8805