Malicious PDF — malware analysis report

Static analysis result for SHA-256 1438c5d9130c3709…

MALICIOUS

PDF

67.0 KB Created: 2020-11-26 10:03:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5aca536558cd54ae37fd1295dd06f2d3 SHA-1: 1dc81370a827cbbd7c3a9e03e7c3c36e5e865d45 SHA-256: 1438c5d9130c3709adc61250e17dfd0301037b793411b47f6f5b2c1e3fe9459f
184 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing indicating it's a malicious redirector link, pointing to the URL https://cctraff.ru/strik. This URL is likely used to lure victims into clicking on it, potentially leading to further malicious content or downloads. The ML classifier also strongly flagged this PDF as malicious.

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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://cctraff.ru/strik?utm_term=what+does+credibility+mean+in+research
    • https://wefolukozik.weebly.com/uploads/1/3/1/4/131406413/zawuxuwilivotu.pdf
    • https://cdn-cms.f-static.net/uploads/4480745/normal_5fbc8c6087b6e.pdf
    • https://zoveponezewuda.weebly.com/uploads/1/3/0/7/130738822/tuzuvebijuk_zumasozen_xumidazi.pdf
    • https://poxanopa.weebly.com/uploads/1/3/4/3/134380657/lisaka-vukitixa-sinil-mewebuxe.pdf
    • https://cdn-cms.f-static.net/uploads/4426423/normal_5f9ed365a6706.pdf
    • https://cdn-cms.f-static.net/uploads/4482882/normal_5fa6e3a08a6d8.pdf
    • https://cdn-cms.f-static.net/uploads/4479454/normal_5fbc8f0b3ab05.pdf
    • https://cdn-cms.f-static.net/uploads/4481168/normal_5fbd9e32bacda.pdf
    • https://volejodanuba.weebly.com/uploads/1/3/4/5/134593723/vimisugamorakov.pdf
    • https://nugekowu.weebly.com/uploads/1/3/4/5/134587082/7615778.pdf
    • https://mutakisutuw.weebly.com/uploads/1/3/4/7/134768563/6359610.pdf
    • https://cdn-cms.f-static.net/uploads/4381320/normal_5f93d04c6ee89.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jedadokuti/pepupowelirodo.pdf
    • https://s3.amazonaws.com/vifusupegiza/avast_antivirus_free_pc_2018.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_off0000c9be.bin
3aa1d013e9700ceac15285ac4bfecbdc5d04b101a6e79c289008619a4f0eeb24		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC9BE 5436 bytes
font_01_sfnt_off0000dc1b.bin
9b774a681c9ed4e642deeaa1f21f1a69fcae39136b117ac14ae168f83a736fd9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC1B 10392 bytes

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