Malicious PDF — malware analysis report

Static analysis result for SHA-256 08ca55b3a15ced0f…

MALICIOUS

PDF

58.7 KB Created: 2020-11-24 17:22:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: da8a18a0f4b3f6f42eddb55a49c37d0a SHA-1: 161f340c183f90007414451a4d97df93e998827f SHA-256: 08ca55b3a15ced0f0763b357851f4d71fb37518820ddcebd7e1e5bd037062813
222 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ggtraff.ru'. Additionally, it exhibits characteristics of a PDF link farm, with numerous external links, one of which is a PDF hosted on AWS. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the presence of a malicious redirector and the link farm suggest an attempt to direct users to a malicious site, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/123?utm_term=jean+jacket+with+fur+collar+and+cuffs In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366336/normal_5f8789b0f19b6.pdfIn PDF document text
    • https://sakukavazu.weebly.com/uploads/1/3/1/3/131379729/1314851.pdfIn PDF document text
    • https://nelibijejukeli.weebly.com/uploads/1/3/1/4/131437261/93c98e.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/dudujopixejikug/suretitujoxenotosudabug.pdfIn PDF document text
    • https://s3.amazonaws.com/miwolezedubujoz/neoplasia_intraepitelial_cervical.pdfIn PDF document text
    • https://s3.amazonaws.com/dufekifaral/memuvezofujomuvare.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/kifiwaxizolisud.pdfIn PDF document text
    • https://s3.amazonaws.com/matogapibelifiv/hernando_county_sheriff_incident_report.pdfIn PDF document text
    • https://s3.amazonaws.com/gixawetopoli/55446149344.pdfIn PDF document text
    • https://s3.amazonaws.com/bubodeliza/daturevow.pdfIn PDF document text
    • https://s3.amazonaws.com/towakog/fire_power_flower_image_from_mario.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_off0000abfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xABFA 5328 bytes
SHA-256: f283458fb3007bdb9a631852497dd414dd53e437958605db9df3c24099f59074
font_01_sfnt_off0000be2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE2C 9352 bytes
SHA-256: b561ab1f121818e2503289f5e4dbf0d748ac2b019033dbe8d3780a992dbac5cf

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