Malicious PDF — malware analysis report

Static analysis result for SHA-256 c08fb1318e4218ca…

MALICIOUS

PDF

42.5 KB Created: 2020-08-31 20:44:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 16650e471958ec831dd83e5145151ab6 SHA-1: 8c368cf1a6c7e7629eebbe0d67148dbae19b537c SHA-256: c08fb1318e4218ca962dd8473ea5f7e77fed0bc36bd6bd8d7f6dadeef5ba2736
152 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, identified as a link farm. One of these links, https://ttraff.cc/wix?keyword=when+attitudes+become+form+bern, points to known malicious redirector infrastructure. The document body, though heavily obfuscated, also contains this URL and other links to static.usrfiles.com, suggesting a social engineering lure to drive traffic to malicious 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/wix?keyword=when+attitudes+become+form+bern
    • https://static.usrfiles.com/ugd/b8c837_fcc17a7272924eab8106535be1aeb6b5.pdf
    • https://static.usrfiles.com/ugd/b8c837_69eacfa2fd24478ab8177c7c07243d6e.pdf
    • https://static.usrfiles.com/ugd/b8c837_d5275f14275f4be9b28eedb7b2fde6de.pdf
    • https://static.usrfiles.com/ugd/b8c837_d2a0d872d3a7454e8ce9df9342e8e8b0.pdf
    • https://static.usrfiles.com/ugd/ea78e0_348da0e8ccb34d0e80035257c2242da6.pdf
    • https://static.usrfiles.com/ugd/b8c837_ff72808bf56a467499be93704337857a.pdf
    • https://static.usrfiles.com/ugd/086daf_716986310e334f5ebb119b0758367d14.pdf
    • https://static.usrfiles.com/ugd/8b97dd_49844f4188eb40adac16db1daf7fb827.pdf
    • https://static.usrfiles.com/ugd/07e02c_b319b53327ef4940aa5ff7da26502ff7.pdf
    • https://static.usrfiles.com/ugd/d5cf39_9ad1fa766136497dbc2f154c699146d2.pdf
    • https://static.usrfiles.com/ugd/d2751c_7e592b68e3a3404ba7e62b2c5b065b51.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_off000068b8.bin
c725ac4a0b30e983d4772c72dccf1d0d7f8d9f82543b8220a71e2814ca1d4c81		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68B8 5380 bytes
font_01_sfnt_off00007ae5.bin
0f79c9cd4a2fcb4dbd7229ada22a5bd022d50f1b365372c40d124fc827208536		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AE5 10076 bytes

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