Malicious PDF — malware analysis report

Static analysis result for SHA-256 314238bee0f3ac6e…

MALICIOUS

PDF

45.4 KB Created: 2020-08-31 09:38:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 14b3f0c6997cdcddd14ac335b787d53a SHA-1: d9ccd959d296a0c73abd740adbf0090243674bfc SHA-256: 314238bee0f3ac6ee1c5b5fae3c43619227ca9d309e96c9b6c92d8614600c9c6
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains numerous embedded links, including one pointing to a known malicious redirector at ttraff.ru. The document body, though heavily obfuscated, contains text related to health and respiration, suggesting a lure to disguise the malicious intent. The ML classifier strongly indicated maliciousness, and the PDF structure itself was flagged for containing a link farm.

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.ru/wix?keyword=respiraci%25C3%25B3n+y+cuidado+de+la+salud
    • https://static.usrfiles.com/ugd/b8c837_b47d828a797a41e9897790c396789d76.pdf
    • https://static.usrfiles.com/ugd/e4a001_c17a61d87a194f76ad4fb1d915c16d37.pdf
    • https://static.usrfiles.com/ugd/c1108c_658375b9b7cd4525a0eea6df300884ec.pdf
    • https://cdn.shopify.com/s/files/1/0432/9262/2998/files/fuzubijupuzopelelo.pdf
    • https://cdn.shopify.com/s/files/1/0462/4436/4448/files/10.pdf
    • https://static.usrfiles.com/ugd/4f270c_77f7268fc2834bc99ba92702b4df01a7.pdf
    • https://static.usrfiles.com/ugd/a44510_0a9effb79dff4936947c58cf0cc64725.pdf
    • https://static.usrfiles.com/ugd/b8c837_a9c5e2d08c574af38a1e288aa41168c6.pdf
    • https://static.usrfiles.com/ugd/b8c837_8391d399524e49a5851cc79f6c8e9f19.pdf
    • https://static.usrfiles.com/ugd/b8c837_29761a4f13a847ff9d8959fd0521ee1f.pdf
    • https://static.usrfiles.com/ugd/c0b427_367d684345fe4e548a899567b85342cf.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_off00006b36.bin
01c4231d31ef3a96a0bf26a5c9a367dbf0a2bbc758acd01d8ed4e54c00da00b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B36 5312 bytes
font_01_sfnt_off00007d1a.bin
c71604a44038f36a3ddf2265579ba07db65c2b2654a251b4d0fa7a5ca387b911		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D1A 13532 bytes

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