Malicious PDF — malware analysis report

Static analysis result for SHA-256 34b4570ac7959a6f…

MALICIOUS

PDF

96.2 KB Created: 2021-01-05 09:06:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: ecd003584d98df256af49f96defaa577 SHA-1: 2b8728a118013c86abe4a1f45c9deb7e16095be9 SHA-256: 34b4570ac7959a6f65a9092167cd3251bc5b4c41dbdd40f30f0f9bdcbdfa0416
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK pointing to 'ggtraff.ru'. Another critical heuristic, PDF_SEO_LINK_FARM, indicates a large number of external PDF links, suggesting a link farm or redirection scheme. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the presence of malicious redirector links and the link farm structure strongly suggest an attempt to direct users to harmful content or infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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/aws?utm_term=ktvb+sports+reporters In PDF document text
    • https://cdn-cms.f-static.net/uploads/4370560/normal_5f91ca84ef7b1.pdfIn PDF document text
    • https://bixolajulepu.weebly.com/uploads/1/3/4/7/134746591/litubuginomul.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382966/normal_5fbda2942a924.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473445/normal_5fec675d6b20a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459641/normal_5fdd1d3738ec4.pdfIn PDF document text
    • https://bilewazivabo.weebly.com/uploads/1/3/2/8/132816117/b05054.pdfIn PDF document text
    • https://genunilime.weebly.com/uploads/1/3/4/3/134344847/kazudawonata_wuwojenuduworem.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446280/normal_5fcab8672c48e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414851/normal_5fd1ecc98a97b.pdfIn PDF document text
    • https://dumisoxi.weebly.com/uploads/1/3/4/6/134625223/2703747.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447640/normal_5fe1216ca753e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c45c38c8-6dce-4ee0-8aea-3b9daee4b3f9/jimiralixoduwojuxasamimo.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_off000137e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137E4 4740 bytes
SHA-256: dad1f0386a27cc59960f5e8e9a707aa294a44f43391c5694d2d0c9d5d7343233
font_01_sfnt_off0001481a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1481A 14204 bytes
SHA-256: 00b816ac46dfab0a39e622135d6613646a88553ac7c006ce2c471eb38968282e

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