Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff713a1c8355ef59…

MALICIOUS

PDF

77.0 KB Created: 2021-01-05 17:33:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 778a107b1a0029d5304c95582f00577d SHA-1: 75b2ab1e361d1abe3dbeb6fb01c74f8b5ccb12c4 SHA-256: ff713a1c8355ef59aafc72bab21f5322be20c4b87a8dbf82e7a8a0741de6605c
162 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link pointing to 'ggtraff.ru'. The document body, though heavily obfuscated, suggests a 'maintenance request form' lure, which is further supported by the 'SE_URGENCY_LURE' heuristic. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the nature of the redirector and the overall context suggest an attempt to deliver a second-stage payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • 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=maintenance+request+form+template+pdf In PDF document text
    • https://cdn.sqhk.co/manuguwe/OhbVhcQ/virus_protection_free_for_windows_10.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491173/normal_5fed153a0f81f.pdfIn PDF document text
    • https://cdn.sqhk.co/xasexuwosul/YjfAjc2/nasacort_aq_generic.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391896/normal_5fe62483771e9.pdfIn PDF document text
    • https://cdn.sqhk.co/lanasido/bhakPgd/rabbit_pop_bubble_mania.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456667/normal_5fb98b882ae26.pdfIn PDF document text
    • https://tujulita.weebly.com/uploads/1/3/4/6/134687611/kuboreze.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379229/normal_5faefe827f374.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491670/normal_5fd2e4504a459.pdfIn PDF document text
    • https://cdn.sqhk.co/dalubevemex/lsnpgjC/83503535666.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454419/normal_5fa51c06cbcc4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418584/normal_5fd27558ebf27.pdfIn PDF document text
    • https://cdn.sqhk.co/rijakobebux/ibjj0iB/suxef.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/nonipesikiri/84646113822.pdfIn PDF document text
    • https://s3.amazonaws.com/dutimajizowa/classic_human_anatomy_in_motion_download.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_off0000f0c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C1 5432 bytes
SHA-256: d40ed1463fc3fb6e243183d8d619ab1cdc3c050acdf99bf9449a97f8deaf2663
font_01_sfnt_off0001032d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032D 10352 bytes
SHA-256: fd5cb6f2bd78c9a4869016e783eb5f9ad1af62154f7e508514ccfc2a0aa9af5c

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