Malicious PDF — malware analysis report

Static analysis result for SHA-256 690dd7dd883b07d2…

MALICIOUS

PDF

37.2 KB Created: 2020-09-29 19:15:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 786ac74b06ace26f479efe5d5c79a6ac SHA-1: a5ca724607add37209f4061a55c3e9a926622f4a SHA-256: 690dd7dd883b07d2d7ba5f4e7c544e25bf6abf895e3f7ce1b090db78632dd4ca
162 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to a link farm designed to host other PDFs, and one specifically leads to a known malicious redirector. The document body text, though partially obfuscated, includes the URL 'https://ggtraff.ru/strik?keyword=smaller+pdf+file+size+online', indicating a lure to potentially malicious content. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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://ggtraff.ru/strik?keyword=smaller+pdf+file+size+online
    • http://files.muslimsagainstporn.com/uploads/1/3/1/4/131438684/3845903.pdf
    • http://files.holisticwellnessconsultant.com/uploads/1/3/0/7/130740530/8431291.pdf
    • http://katazi.abcspanishnow.com/uploads/1/3/1/4/131405958/8a807d2.pdf
    • http://tukuze.laurendobee.com/uploads/1/3/1/4/131483128/ponejujaguli-buriwojunuvevew-vivibevovabu.pdf
    • https://site-1036962.mozfiles.com/files/1036962/vefafelekofuniwezima.pdf
    • https://site-1036751.mozfiles.com/files/1036751/nomarerixax.pdf
    • https://site-1036667.mozfiles.com/files/1036667/83080937090.pdf
    • https://site-1036935.mozfiles.com/files/1036935/86602935572.pdf
    • http://files.victoryindependentplanning.com/uploads/1/3/2/6/132695493/nafuniferoj.pdf
    • http://files.stephenieayoung.com/uploads/1/3/2/8/132814742/gulevinufewel.pdf
    • http://fikulol.athletetrainingsystems.co.uk/uploads/1/3/1/4/131482993/jibigoj.pdf
    • http://files.raemiz.com/uploads/1/3/1/1/131164164/bexijava-vurokonazof.pdf
    • http://files.studio519.net/uploads/1/3/0/7/130776542/024069.pdf
    • http://mopugisax.pocketinstructor.co.uk/uploads/1/3/0/8/130873947/defabagi_pabuguzepome.pdf
    • http://files.cgwoodcreations.com/uploads/1/3/1/3/131384468/panowasev.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off00005309.bin
adec9e08f48c275d5dd199dd9a2aa12459aa0083bf776ade57472508208083fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5309 5340 bytes
font_01_sfnt_off00006521.bin
035ae8c5e195f1c7a96ab18d9d6ab5ed8e24db0e4f8c26b7378d476121337e8d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6521 10196 bytes

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