Malicious PDF — malware analysis report

Static analysis result for SHA-256 276caf864ab35929…

MALICIOUS

PDF

46.0 KB Created: 2020-07-08 11:31:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-08-25
MD5: 694df2343dc55a7089e1368be475cd1e SHA-1: 296dbcb4f19d95b2d7f4f07300cbdad8dd156dcf SHA-256: 276caf864ab3592938f9e2c8ac015880f7dd4e0f0ebee7e356fe35359aa8540c
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded links, identified as a PDF link farm. One critical heuristic indicates these links point to known malicious redirector infrastructure. The document body, though partially obfuscated, contains text related to 'Tecnicas cognitivo conductual para autoestima pdf' and includes URLs that are part of this link farm, suggesting a lure to potentially malicious content. No scripts were extracted from this sample.

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://ttraff.ru/wb?keyword=tecnicas%20cognitivo%20conductual%20para%20autoestima%20pdf In PDF document text
    • http://files.anndcroghanart.com/uploads/1/3/0/7/130776578/turidufuletax.pdfIn PDF document text
    • http://files.rebelliousrheaboutique.shop/uploads/1/3/1/4/131406413/2090860.pdfIn PDF document text
    • http://files.livinggodsmission.com/uploads/1/3/0/8/130874413/femobupowufebekoluta.pdfIn PDF document text
    • http://files.westfielddentalpa.com/uploads/1/3/0/7/130775942/bavef_kezujuwusuk_javexolizepun.pdfIn PDF document text
    • http://files.hebrewdayschool.org/uploads/1/3/0/9/130969242/noxomixupiwupejosenu.pdfIn PDF document text
    • http://files.blueacesbakeshoppe.com/uploads/1/3/2/6/132696263/1387438.pdfIn PDF document text
    • http://files.careerlinkhighschool.org/uploads/1/3/0/7/130776578/bijapemopebujo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://fudamowoz.files.wordpress.com/2020/06/77487727848.pdfIn PDF document text
    • https://kibemiratet.files.wordpress.com/2020/06/nazukabeva.pdfIn PDF document text
    • https://pulimiwuri.files.wordpress.com/2020/06/tuporipu.pdfIn PDF document text
    • https://zodamutove.files.wordpress.com/2020/06/gesasexezep.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_off00005ff7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FF7 5368 bytes
SHA-256: 162333e3479155e34c52cf0c70ca7cd69abc230fd48a052d2780f42b83067d85
font_01_sfnt_off0000721f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x721F 10404 bytes
SHA-256: 31b736e0aa05e39d0926b40778f7d59f1220ffe87f2207bccc0d556f63ff0c68
font_02_sfnt_off0000940f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x940F 16128 bytes
SHA-256: 7df9c757af567881a6ec1e901ed80cfbb3f6e307e96188de676cc30f15be1dd4