Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b5c5177216579a3…

MALICIOUS

PDF

44.1 KB Created: 2020-10-07 04:42:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: db20e97d7d65b29777cc2a751e5e62b3 SHA-1: 758deb79573e2bf10e54f598e6d483e1dcbd22d6 SHA-256: 1b5c5177216579a317077d8e82ecd77fbf30477a86e145bb033c275c68c00f41
124 Risk Score

Malware Insights

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

The PDF contains numerous embedded links pointing to disposable hosting domains and a known malicious redirector. The document body, though obfuscated, contains keywords related to software cracks, suggesting a lure for users seeking illegal downloads. The ML classifier strongly indicated maliciousness, and the link farm heuristic confirms the suspicious nature of the embedded URLs.

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://gettraff.ru/strik?keyword=nba+2k14+reloaded+crack+free+download In PDF document text
    • http://zafilo.twofriendsmetalsculpture.com/uploads/1/3/2/8/132814930/4a90d7f0.pdfIn PDF document text
    • http://rigunuma.gainstageproductions.com/uploads/1/3/1/4/131406082/linena.pdfIn PDF document text
    • http://files.ellislakeresort.com/uploads/1/3/1/6/131636845/3269561.pdfIn PDF document text
    • http://files.heshooktheworld.com/uploads/1/3/0/8/130874264/nuzox_bisikuwaxijew.pdfIn PDF document text
    • http://files.bethlehemctcommunitygarden.org/uploads/1/3/1/4/131407310/vapevuxibanonefoja.pdfIn PDF document text
    • http://kupofijow.materials-glasgow.org/uploads/1/3/2/8/132815916/1681267.pdfIn PDF document text
    • http://files.merakihh.com.au/uploads/1/3/1/4/131437172/nelejowebar_kiwibo.pdfIn PDF document text
    • http://zenuj.lieberconsulting.com/uploads/1/3/1/4/131406841/tupuneb-botovelar-kagig.pdfIn PDF document text
    • http://files.lewestonshop.co.uk/uploads/1/3/2/8/132814228/7541010.pdfIn PDF document text
    • https://site-1036675.mozfiles.com/files/1036675/zexiluvif.pdfIn PDF document text
    • https://site-1048564.mozfiles.com/files/1048564/valisoxugep.pdfIn PDF document text
    • https://site-1039783.mozfiles.com/files/1039783/51619132530.pdfIn PDF document text
    • https://site-1037275.mozfiles.com/files/1037275/towutovufuvimujutu.pdfIn PDF document text
    • https://site-1048552.mozfiles.com/files/1048552/vepawujutowekozilonadirof.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0000898f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x898F 17492 bytes
SHA-256: ae8cac709a32a589218e4e8f2e613b7645fa54985fd5f9aaca0398fba9b21134
font_00_sfnt_off0000544c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x544C 5376 bytes
SHA-256: 54b36574cc8e935bbe0641d0fb54498ac51e7120e1c8ec28703ca00e8ca1d37e
font_01_sfnt_off000066cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66CB 10100 bytes
SHA-256: 4b29138b23ef5d414185c2d9e0654af4ec193d2e6301f20010fb400e4ee486b7

Open this report in the interactive analyzer, or submit your own file for analysis.