Malicious PDF — malware analysis report

Static analysis result for SHA-256 6773c9bb7517b1ce…

MALICIOUS

PDF

77.7 KB Created: 2021-01-12 23:07:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: ab0487ab8ad0265b26117405b20ce8e0 SHA-1: 347cad4d8bcc0f3c62fa4c7255fc9da0d121c227 SHA-256: 6773c9bb7517b1ce3bf9112795d7143f4bb7dc6fedbb24e88347d60c3a148967
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources, indicating a link farm or redirection strategy. One critical heuristic identified a link to known malicious redirector infrastructure, specifically 'gettraff.ru', which is used to drive traffic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gettraff.ru/wb?keyword=groovepad%20music%20beat%20maker%20itunes In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369907/normal_5f8f893fd63fe.pdfIn PDF document text
    • https://site-1203683.mozfiles.com/files/1203683/83672437863.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446638/normal_5fda5eec9335d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454562/normal_5fdbb7dfd9b1d.pdfIn PDF document text
    • https://site-1173658.mozfiles.com/files/1173658/how_to_find_nearby_friends_on_facebook_web.pdfIn PDF document text
    • https://lowizozexide.weebly.com/uploads/1/3/0/7/130776176/e149b5e8d534a.pdfIn PDF document text
    • https://site-1171987.mozfiles.com/files/1171987/ganasizekemite.pdfIn PDF document text
    • https://site-1178547.mozfiles.com/files/1178547/pojuvanavipedofoganuzufu.pdfIn PDF document text
    • https://site-1195189.mozfiles.com/files/1195189/iron_off_meaning_in_tamil.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367273/normal_5ff108e496c4f.pdfIn PDF document text
    • https://site-1177603.mozfiles.com/files/1177603/anima_arpg_2020_mod_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mipeboro/43077360104.pdfIn PDF document text
    • https://s3.amazonaws.com/dinisemowoge/jajeguletaxef.pdfIn PDF document text
    • https://s3.amazonaws.com/fifomi/income_guidelines_for_medicaid_in_arkansas.pdfIn PDF document text
    • https://s3.amazonaws.com/nefagolom/70778312049.pdfIn PDF document text
    • https://s3.amazonaws.com/tometubufimopim/navalenul.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF151 5484 bytes
SHA-256: 58000157bbe2a572a5919d51b6af9065871b15bbc26bfc36d20b94eb4f8e0393
font_01_sfnt_off000103e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E6 11184 bytes
SHA-256: 2246248fb768ed9180ec5ef938672160bd71a8749a17627342352510e9f5d91b

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