Malicious PDF — malware analysis report

Static analysis result for SHA-256 a34ee3332d062eb0…

MALICIOUS

PDF

39.6 KB Created: 2020-11-08 02:15:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d90285dbc2a345c70848c3e1abfba0b3 SHA-1: 54fad52d95b33cc96033e2de5708ed91ac3892b5 SHA-256: a34ee3332d062eb0c621f544c6773f3e1b37941aeafd3c3a22daac529676468e
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a malicious redirector link, identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic, pointing to 'https://traffmen.ru/123?keyword=badlion+download+link'. The document body also contains this URL and text suggesting a download lure, which is further supported by the 'SE_DOWNLOAD_BUTTON' heuristic. The ML classifier strongly flagged this PDF as malicious.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://traffmen.ru/123?keyword=badlion+download+link
    • https://cdn-cms.f-static.net/uploads/4365662/normal_5f873b6492d60.pdf
    • https://wazajodowefode.weebly.com/uploads/1/3/4/0/134017502/08a2d4982.pdf
    • https://cdn-cms.f-static.net/uploads/4365599/normal_5f870e0fc3390.pdf
    • https://tugarekuxu.weebly.com/uploads/1/3/4/3/134307697/2305233.pdf
    • https://cdn-cms.f-static.net/uploads/4368955/normal_5f8d36f517bad.pdf
    • https://cdn-cms.f-static.net/uploads/4383300/normal_5f8bd8fc05fac.pdf
    • https://cdn-cms.f-static.net/uploads/4423171/normal_5fa07d2be453d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fapaga/18190472922.pdf
    • https://witizugab.files.wordpress.com/2020/11/fogelu.pdf
    • https://sevuropigo.files.wordpress.com/2020/11/convergence_and_divergence_of_a_sequence.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005fbf.bin
73f0e68671a36123aeb682100ec31c42d580b896553a3315a6442ecb7fa767c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FBF 4748 bytes
font_01_sfnt_off0000700f.bin
849f92af04f09c48d9e8c44f69266f078e0bb27a9a9f8552f07b0de3b7c0ce33		 pdf-font-stream PDF embedded font (sfnt) at offset 0x700F 10008 bytes

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