Malicious PDF — malware analysis report

Static analysis result for SHA-256 1325ea5044e3dfd0…

MALICIOUS

PDF

54.1 KB Created: 2020-10-27 19:18:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: e4912bff6a7ba1a4b33b0d759090ae51 SHA-1: 399dd6b0d63b9dcf9311a6f9a8f029859366e588 SHA-256: 1325ea5044e3dfd01d9ee7dc9a3fd7bc03472700d5354f40fc4d6dde59184fd5
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains a URL that matches one of the embedded links, suggesting an attempt to lure the user to external content. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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://ggtraff.ru/pify?keyword=por+lo+que+in+english In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369771/normal_5f948ac42a836.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369640/normal_5f8961cb43bc6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407782/normal_5f94ee8cf2cdf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366324/normal_5f8b6699bc472.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369794/normal_5f88473c042e9.pdfIn PDF document text
    • https://nizesuvijeva.weebly.com/uploads/1/3/1/6/131607023/navefugiwiru_fogifej.pdfIn PDF document text
    • https://giwakatunu.weebly.com/uploads/1/3/1/4/131437107/xaloni.pdfIn PDF document text
    • https://xujaxivef.weebly.com/uploads/1/3/1/4/131438557/dubawewu-ruvexumobeze-juguzedoto.pdfIn PDF document text
    • https://suganolorifumu.weebly.com/uploads/1/3/0/8/130814011/b31bc455.pdfIn PDF document text
    • https://jawowigo.weebly.com/uploads/1/3/0/7/130774982/bidawesexot.pdfIn PDF document text
    • https://wefamojugibe.weebly.com/uploads/1/3/1/1/131164519/xuxomoloxub.pdfIn PDF document text
    • https://turomanusogagi.weebly.com/uploads/1/3/1/4/131453559/61f82309.pdfIn PDF document text
    • https://xezinaruwi.weebly.com/uploads/1/3/4/4/134479948/8160167.pdfIn PDF document text
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/kinufijozulof.pdfIn PDF document text
    • https://zifidobu.weebly.com/uploads/1/3/4/3/134371145/f34ec30a6f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wonoti/rewugewesuzutelatufipero.pdfIn PDF document text
    • https://s3.amazonaws.com/patotale/roadshow_presentation.pdfIn PDF document text
    • https://s3.amazonaws.com/gidibesuxi/adjective_and_adverb_exercises_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/lexowumok.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/9494/2919/files/vidimosilufatapemoz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/4058/3061/files/i_am_legend_imdb_parents_guide.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_off00007e4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E4A 4864 bytes
SHA-256: 8a56e1f941e9a85eb7263e0a8700ff535357e190ec2a6c7ca2f4e63ff8370425
font_01_sfnt_off00008ed3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8ED3 11440 bytes
SHA-256: 15a345691f92e03dfa91ee24a7f991c1c8240aecda4876b4f1ad2f0a48f1bdca
font_02_sfnt_off0000b496.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB496 16068 bytes
SHA-256: b87f97ee19d0eebf852dd88b0ab32469aeb165aad349e9abc0ff3cff3eb64326