Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca9f523b372e8398…

MALICIOUS

PDF

39.4 KB Created: 2020-10-03 22:13:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1cf3800df5cf42952db0dd59242ae2f1 SHA-1: 48f29a2b8b45766f8c309b2c95c5ca07feabbcd0 SHA-256: ca9f523b372e83984167de755815163a1f81e2ecc4e321b2562792eeb8ddbce4
92 Risk Score

Malware Insights

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

The PDF contains a direct link to a known malicious redirector, indicating a high likelihood of malicious intent. The ML classifier also strongly flagged this PDF. The embedded URLs suggest a pattern of hosting malicious content on compromised or disposable domains. No scripts were extracted from this sample, but the presence of a malicious redirector is sufficient evidence of a malicious campaign.

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://gettraff.ru/strik?keyword=electric+motor+controls+for+integrated+systems+pdf
    • http://files.kayscience.com/uploads/1/3/1/6/131606396/masozuzarapog.pdf
    • http://pijoguna.plearnmc.com/uploads/1/3/0/7/130776078/5602896.pdf
    • http://files.westsidemarketrochester.com/uploads/1/3/1/3/131398159/4553160.pdf
    • http://files.rebekahleach.com/uploads/1/3/1/6/131636792/a1fe399e7582903.pdf
    • https://site-1036924.mozfiles.com/files/1036924/vimegizugaburiwanobelo.pdf
    • https://site-1036767.mozfiles.com/files/1036767/kaxitakirope.pdf
    • https://site-1036646.mozfiles.com/files/1036646/78114129880.pdf
    • https://site-1037018.mozfiles.com/files/1037018/lejawusigawetumoxasufami.pdf
    • https://site-1036820.mozfiles.com/files/1036820/80166134205.pdf
    • https://site-1037193.mozfiles.com/files/1037193/11002946760.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_off00005a8c.bin
a404acd07f88bf064221fc467c4e557c104e78341089868845ae2112832f17af		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A8C 5532 bytes
font_01_sfnt_off00006d56.bin
57e2dc1a4a94a1d9215b824d9d767b5e3f1c86b8a5390367b07e29bf2c9f67e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D56 10224 bytes

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