Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f39075396cb8779…

MALICIOUS

PDF

60.4 KB Created: 2020-09-30 13:26:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 5c5c9e048e3816d9e939ad6c904c91e7 SHA-1: e721bee20e19e42cdfe363ee7cd3f4cf8294d395 SHA-256: 7f39075396cb87794d1f3ac5e18618c6ed46906803e2d51fc703f3632650f94a
192 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which are identified as malicious redirectors or hosted on disposable domains. The document body, though heavily obfuscated, contains a URL that is also flagged as a malicious redirector. This indicates the primary purpose of the file is to lure users into clicking malicious links, likely leading to further compromise or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://ggtraff.ru/strik?keyword=java+ee%25E6%25A1%2586%25E6%259E%25B6%25E6%2595%25B4%25E5%2590%2588%25E5%25BC%2580%25E5%258F%2591%25E5%2585%25A5%25E9%2597%25A8%25E5%2588%25B0%25E5%25AE%259E%25E6%2588%2598%25E2%2580%2594%25E2%2580%2594+spring%252B+spring+mvc%252B+mybatis+pdf In PDF document text
    • http://zebad.ehopejewelry.com/uploads/1/3/1/6/131637027/mizorawenu.pdfIn PDF document text
    • http://files.madpuzzler.com/uploads/1/3/2/6/132682338/mesiwelojutazo.pdfIn PDF document text
    • http://movij.cincigreyhounds.com/uploads/1/3/2/6/132695471/fobizu_gitemala_dodute_zitapi.pdfIn PDF document text
    • http://files.longbeachcarpetclean.com/uploads/1/3/1/4/131407315/2717209.pdfIn PDF document text
    • https://site-1036779.mozfiles.com/files/1036779/kuragafatunozinojolelu.pdfIn PDF document text
    • https://site-1038700.mozfiles.com/files/1038700/donifenojuxitijutagota.pdfIn PDF document text
    • https://site-1037188.mozfiles.com/files/1037188/90229139812.pdfIn PDF document text
    • https://site-1036724.mozfiles.com/files/1036724/butarutorasegirawasatuwu.pdfIn PDF document text
    • https://site-1037221.mozfiles.com/files/1037221/wupaxerotanimaweterofun.pdfIn PDF document text
    • https://site-1036935.mozfiles.com/files/1036935/sigimabenukokomiruxiw.pdfIn PDF document text
    • https://site-1036823.mozfiles.com/files/1036823/kenajemajegogulo.pdfIn PDF document text
    • https://site-1037003.mozfiles.com/files/1037003/ridalugilojet.pdfIn PDF document text
    • https://site-1036972.mozfiles.com/files/1036972/96586076481.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0464/9543/2872/files/26760032568.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0447/1462/3130/files/feriseguteda.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000758c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x758C 6580 bytes
SHA-256: 7b190d5c5a95f59893866c08167e003cb6838daf84214daed9dd6f2da20cb81d
font_01_sfnt_off00008b46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B46 5460 bytes
SHA-256: a5caf3bb25ba23a24db3b424d4696e423fe5ce4b5d22083ffbd65d05f9af1c53
font_02_sfnt_off00009e36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9E36 5764 bytes
SHA-256: acdeb1d1eb71634c36b1aa1223bb37796e5f6efc1a84c154e1d3821b91545903
font_03_sfnt_off0000b1d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1D1 15016 bytes
SHA-256: e6547f9317625fa8cc73c438f04697e47ff067e2c1a1fdfa7b4fdecdad58b555