Malicious PDF — malware analysis report

Static analysis result for SHA-256 027ad9b37f29e065…

MALICIOUS

PDF

67.8 KB Created: 2020-12-21 13:43:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 02699d312c908c876cbeb19ab06993be SHA-1: b7dff94958c599d3305f28bdbfd110b9dd7f0291 SHA-256: 027ad9b37f29e0652d800b0a792ab984ae0fca7e40093fc1bba53d7c994930e4
214 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, specifically identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The document body, though heavily obfuscated, appears to be a lure using a popular search term to entice clicks. The presence of numerous external PDF links also suggests a link farm or SEO manipulation tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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?utm_term=prison+break+season+5+netflix+australia+release+date
    • https://rivisoni.weebly.com/uploads/1/3/0/7/130739016/4762810.pdf
    • https://viweposedijul.weebly.com/uploads/1/3/1/0/131070314/5cb3a2e3.pdf
    • https://cdn-cms.f-static.net/uploads/4494138/normal_5fad7626618d6.pdf
    • https://cdn-cms.f-static.net/uploads/4379473/normal_5f8fad68609fc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/panokojol/resume_format_template_free.pdf
    • https://s3.amazonaws.com/gowupuzokowuxes/bufuniratonanabojunuj.pdf
    • https://s3.amazonaws.com/gezizefefififa/32669256226.pdf
    • https://uploads.strikinglycdn.com/files/776bb580-306b-45d9-a3c0-c612cdab48ba/wuzeselak.pdf
    • https://s3.amazonaws.com/fofeguj/76124524963.pdf
    • https://s3.amazonaws.com/womirofop/egyptian_cotton_fitted_sheet_amazon.pdf
    • https://s3.amazonaws.com/henghuili-files/wafexom.pdf
    • https://s3.amazonaws.com/tezofuretejom/the_woman_who_smashed_codes.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_off0000cc8b.bin
e5536f0c182757be41de3df6213bfe119b8b353c7eb6d09350ca73b2f2e03b2d
pdf-font-stream PDF embedded font (sfnt) at offset 0xCC8B 5300 bytes
font_01_sfnt_off0000dea8.bin
de7daa54161be94cf3e1408c94aaecf17fb08f615aa7b64b58ea4fb83976cd57
pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA8 10248 bytes