Malicious PDF — malware analysis report

Static analysis result for SHA-256 b77377aed79e82cf…

MALICIOUS

PDF

46.4 KB Created: 2020-10-02 19:36:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: e21c1e2a0713aef11010e899567f4836 SHA-1: 7de91dd1938dd562435cc491876bce48edf203c9 SHA-256: b77377aed79e82cf552e469b79c54a67ce20fed76bb4055e0cbf4c406151130f
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded links, many of which point to disposable domains and redirectors. One URL, 'https://gettraff.ru/strik?keyword=google+drive+men+in+black+international', is explicitly flagged as malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. This suggests the document is designed to lead users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • 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.
  • 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://gettraff.ru/strik?keyword=google+drive+men+in+black+international In PDF document text
    • http://kamak.wattleandoak.com.au/uploads/1/3/1/4/131483418/3043475.pdfIn PDF document text
    • http://files.drericamattia.com/uploads/1/3/1/3/131381021/nukizavodipaki.pdfIn PDF document text
    • http://files.universalwellnessconnections.com/uploads/1/3/1/4/131453658/nafafo_biwofakuxu_nazekelipusoza_winowe.pdfIn PDF document text
    • https://site-1037218.mozfiles.com/files/1037218/tinixubuxiwediri.pdfIn PDF document text
    • https://site-1039897.mozfiles.com/files/1039897/runij.pdfIn PDF document text
    • https://site-1039400.mozfiles.com/files/1039400/detiwewopojidebowi.pdfIn PDF document text
    • https://site-1038453.mozfiles.com/files/1038453/jorudevoxozal.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/a1140aba-de42-4159-b1f1-4eec7df0eb1f/24864981367.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/056cc423-6190-48b7-981a-332650e8f20a/felinomok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bc2fa9e-6e16-47dd-b9e0-33f57b7ca99a/34316388444.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7148d31f-e74f-4837-8d4e-ba6e799d8bda/mijovotoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eaef3e05-f5ec-435a-9fa3-d742354b477e/92875648867.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/447e1095-d9ec-4cbc-ae1f-2d277cd3a2fd/jutele.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d17282c-d74e-4212-80eb-2dad5017b88b/pogaxufe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21cb8274-7456-45be-ad2e-b275ad32ad3c/jiwunigivezesuj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e309b80-e655-4f7e-a70e-face0d2a54bc/76051750005.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0339d873-8eff-4a3c-9dbb-7355d1afce3b/91464681483.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006a30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A30 5164 bytes
SHA-256: 8a787e07b98e51b6f77e3e9b4a9f1eea10e3abbcfe49eabdc1ecf4c566bb94d1
font_01_sfnt_off00007baf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7BAF 10176 bytes
SHA-256: bc4852ad3c3974748c24e0e19afb222ad8a03a0fcf4fd5f58172698fd0b22054
font_02_sfnt_off00009e8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9E8B 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71