Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f506a74356482ac…

MALICIOUS

PDF

33.9 KB Created: 2020-10-02 04:32:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 74b944ed9844299049837af958cce14f SHA-1: 7369fa056de76257a09c6193db974b9ec091b445 SHA-256: 5f506a74356482ac82825e56e8e374de1f6f648cbe3493410386014de2364726
124 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, specifically `https://cctraff.ru/strik?keyword=microbiology+lab+manual+leboffe`. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to disguise malicious content as a legitimate document. The ML classifier strongly flagged this PDF as malicious, indicating a high probability of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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 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?keyword=microbiology+lab+manual+leboffe In PDF document text
    • http://files.horsetoheart.net/uploads/1/3/1/4/131406843/47949.pdfIn PDF document text
    • http://bikovezos.sbmcwilliams.com/uploads/1/3/0/7/130775443/3b37565daa98.pdfIn PDF document text
    • http://files.fourmotion.com/uploads/1/3/1/6/131606260/tajogib.pdfIn PDF document text
    • http://waluloruw.skippingnt.com.au/uploads/1/3/1/4/131407469/gapelise_gosomozonebu_zemerubi_bupisusimadip.pdfIn PDF document text
    • https://site-1036651.mozfiles.com/files/1036651/49197239934.pdfIn PDF document text
    • https://site-1037922.mozfiles.com/files/1037922/fetegegolagenumo.pdfIn PDF document text
    • https://site-1037111.mozfiles.com/files/1037111/zesubore.pdfIn PDF document text
    • https://site-1037205.mozfiles.com/files/1037205/43675755831.pdfIn PDF document text
    • https://site-1036920.mozfiles.com/files/1036920/kuvubopad.pdfIn PDF document text
    • https://site-1040171.mozfiles.com/files/1040171/14447198181.pdfIn PDF document text
    • https://site-1037266.mozfiles.com/files/1037266/13664962116.pdfIn PDF document text
    • https://site-1038455.mozfiles.com/files/1038455/88544224190.pdfIn PDF document text
    • https://site-1036646.mozfiles.com/files/1036646/37415161247.pdfIn PDF document text
    • https://site-1039735.mozfiles.com/files/1039735/51491757105.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00004a48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4A48 5268 bytes
SHA-256: 99c2c2936baa178434cc5872958baee409d2bacf5b849958e56d8e80bd085f39
font_01_sfnt_off00005c3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C3C 8880 bytes
SHA-256: 44dc6c40b4d5217bb9885ed41f5a51cf5f6b836aa06740cbc160c66dd51dbbb3

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