Malicious PDF — malware analysis report

Static analysis result for SHA-256 e662c98dd4000f09…

MALICIOUS

PDF

73.9 KB Created: 2021-01-11 22:01:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 7d65d59f43108c10765fa303aed212da SHA-1: dc994fabbdb53b6fc99a3ff17fe3ed313ee63b9a SHA-256: e662c98dd4000f091aa142f04232bfe875e4e23e9a10d7c7604c5100e21b6c91
124 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically identified as a redirector to malicious infrastructure. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the presence of numerous links on disposable hosting suggests a link farm designed to lure users to potentially harmful sites, possibly for phishing or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffking.ru/123?utm_term=queen+bees+and+wannabes+pdf+portugues In PDF document text
    • https://site-1171500.mozfiles.com/files/1171500/8182780526.pdfIn PDF document text
    • https://wulejowaru.weebly.com/uploads/1/3/4/8/134886315/fevulonavosaza_vupeduvo_kemawig_vaketowaru.pdfIn PDF document text
    • https://site-1183794.mozfiles.com/files/1183794/rosoxagawugesuvina.pdfIn PDF document text
    • https://fijojonibiw.weebly.com/uploads/1/3/2/6/132681787/a8401ec7a9859.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488092/normal_5ff079500f2d8.pdfIn PDF document text
    • https://cdn.sqhk.co/kejofuvata/2TijkxR/hakuouki_shinsengumi_kitan_episode_1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470968/normal_5fb98ea6baf05.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412377/normal_5f9680ecef494.pdfIn PDF document text
    • https://site-1175190.mozfiles.com/files/1175190/18499032331.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366003/normal_5f9486d6795c7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408483/normal_5fc95994cb373.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE398 5468 bytes
SHA-256: 1fcfb069c6489072c1d9b8f6462454018eb4979a48c591ab59b4102a8ade22f9
font_01_sfnt_off0000f649.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF649 10736 bytes
SHA-256: 774171b1c309c9cdf550da64a4be0ad2402b9e804cbc234a8ede6f888bf9c00e

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