Malicious PDF — malware analysis report

Static analysis result for SHA-256 5201c555bb03d36e…

MALICIOUS

PDF

53.3 KB Created: 2020-10-02 18:21:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: e97d49c1e4e0bac44c7153305fd643b7 SHA-1: 29ae213c4db9173278e4fa8a4b543ffa71a2d113 SHA-256: 5201c555bb03d36e76e3b86051d4c374c52fdf9447e47646cce9eab46fea11cf
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with several pointing to known malicious redirector infrastructure and link farms. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains a URL that is also present in the heuristics and IOCs, suggesting a phishing or redirection attempt.

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 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://cctraff.ru/strik?keyword=demontage+pare+choc+arriere+scenic+3 In PDF document text
    • http://files.mzsacredhealing.com/uploads/1/3/0/7/130739621/dd1a72f3663cf.pdfIn PDF document text
    • http://wowok.cafeyugo.com/uploads/1/3/2/7/132740249/bfe5df2596855.pdfIn PDF document text
    • http://files.fourthmoonmusic.com/uploads/1/3/2/7/132741225/7c5c95931736a.pdfIn PDF document text
    • https://site-1039132.mozfiles.com/files/1039132/47019994555.pdfIn PDF document text
    • https://site-1039607.mozfiles.com/files/1039607/sovilakov.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/bece8b4e-3142-41ae-ad37-15071089c11d/44280499447.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1de03709-3557-4351-8e31-4cfffb647f42/29652497766.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/691e9330-86ff-487d-9359-9cc8bc32f049/gigelimuziloz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59b46e04-1d98-43d3-8cfb-36ca262e2544/kelit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a31ebec9-c019-441d-8614-6d54dab695a7/bowusopag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c479d8d-565e-4a5a-a9e9-e73c27481287/13909438321.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5232da6c-8901-417b-9362-0c6ebcbeda75/40299138826.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000798a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x798A 5476 bytes
SHA-256: fde0316009003cc7b92abd0feb01516c69155f762fd3bbbb50d55c84f5f867bc
font_01_sfnt_off00008c0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C0B 10828 bytes
SHA-256: 25cb6671495d3f8d22f02e6a3fa9736cbf2f6b0f69763ed2bb4b0d056e59ffcb
font_02_sfnt_off0000b0ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0FF 16196 bytes
SHA-256: 7c3f8eebdd5b6a211293372c5e6f59034f53d317afc261856be1fe51824f6f8b

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