Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf7150664d5624dc…

MALICIOUS

PDF

70.7 KB Created: 2020-10-07 00:40:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 507b01e345ada81ddd0d371b0516b009 SHA-1: 6ee819e79c7dca6c8cd8ed1990016bdbdc8a9d68 SHA-256: bf7150664d5624dcb6d97e5da196fd31ded5a0633f69652053d00237dd8b0f78
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a large number of embedded links, many of which point to disposable domains and are likely part of a link farm. One prominent URL, https://cctraff.ru/strik?keyword=num%25C3%25A9ro+d%2527+immatriculation+arret+de+travail, is flagged as a malicious redirector. The document body, though partially corrupted, contains text related to "Numéro d'immatriculation arret de travail", suggesting a lure to trick users into clicking the malicious links.

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://cctraff.ru/strik?keyword=num%25C3%25A9ro+d%2527+immatriculation+arret+de+travail In PDF document text
    • http://files.rcstaffinc.com/uploads/1/3/1/4/131438759/wegonitib-zokusulujixutab.pdfIn PDF document text
    • http://files.lynchbaseballtraining.com/uploads/1/3/1/6/131606636/tepafajizog.pdfIn PDF document text
    • http://files.camppepper.com/uploads/1/3/0/7/130776529/mumedi_tinudewarusemi.pdfIn PDF document text
    • http://files.bethanysanderson.com/uploads/1/3/1/4/131482946/ginoxaron.pdfIn PDF document text
    • http://files.phase1trackclub.com/uploads/1/3/1/4/131437157/8534241.pdfIn PDF document text
    • http://vekizular.kathsdisneydollars.com/uploads/1/3/0/8/130814408/sadaxemakeweru.pdfIn PDF document text
    • https://site-1038353.mozfiles.com/files/1038353/75542128723.pdfIn PDF document text
    • https://site-1038451.mozfiles.com/files/1038451/78011358855.pdfIn PDF document text
    • https://site-1043332.mozfiles.com/files/1043332/wodipunepi.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/bd0c75f6-a75e-4eb9-9229-32d00bc72482/19421578967.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44d8da51-176a-4fda-8805-014ab4c31d01/werapumagi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf7087d8-7abf-43c2-8692-611d50d18b0e/19504797637.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b405ddb5-27e1-4cff-aeb1-6d330fe6187b/36721173674.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_off0000c37d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC37D 4996 bytes
SHA-256: 722c379695c2d8de4bbcff26e6fe3cbd8bdb74a9474326d8a28428c1b092aebe
font_01_sfnt_off0000d41f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD41F 13032 bytes
SHA-256: 9b83579fc1fd34b1e73c43532173b6ce9f1025a7500198f38e0c5274189314b0
font_02_sfnt_off0000fcf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF3 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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