Malicious PDF — malware analysis report

Static analysis result for SHA-256 25161115fc7fddb4…

MALICIOUS

PDF

121.9 KB Created: 2021-01-12 11:16:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ad073bd99e5dfdd8b5e2704cb8a63afc SHA-1: 79dfddc5f04f98ff96b850da94ee09c2ad9a5f8c SHA-256: 25161115fc7fddb4eee56d22b6566d8b4be4710f7ef5eb05c2d6b5007e0ea1e1
124 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one pointing to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains keywords related to 'Borussia Dortmund' and 'managers', likely as a lure. The ML classifier strongly indicated maliciousness, and the presence of numerous links on disposable hosting further supports a malicious intent to redirect users to harmful sites.

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://gettraff.ru/aws?utm_term=borussia+dortmund+former+managers
    • https://site-1178650.mozfiles.com/files/1178650/warhammer_age_of_sigmar_starter_set_review.pdf
    • https://woxoxuwavi.weebly.com/uploads/1/3/4/6/134689382/pufarokitana-jasez-tunurub-fosositexaso.pdf
    • https://static.s123-cdn-static.com/uploads/4425491/normal_5ff47cd7451fd.pdf
    • https://cdn-cms.f-static.net/uploads/4491934/normal_5fe9b6efdfc41.pdf
    • https://zatakigufexip.weebly.com/uploads/1/3/0/7/130738978/7bf9a586f4.pdf
    • https://site-1177585.mozfiles.com/files/1177585/93594882616.pdf
    • https://site-1168340.mozfiles.com/files/1168340/tunotitilipuvowupopukev.pdf
    • https://site-1175236.mozfiles.com/files/1175236/medutanubozate.pdf
    • https://static.s123-cdn-static.com/uploads/4368989/normal_5fca4c2d30638.pdf
    • https://site-1173632.mozfiles.com/files/1173632/ark_basic_survival_guide_ps4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/rubidokezive/cpt_code_for_naviculocuneiform_joint_injection.pdf
    • https://s3.amazonaws.com/xenavuxa/format_coordonnes_gps_conversion.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00019c8a.bin
f59d09be14da1cd3a48b3c4d23b655f073dadb45909b845419fb31af602ae878
pdf-font-stream PDF embedded font (sfnt) at offset 0x19C8A 5244 bytes
font_01_sfnt_off0001ae49.bin
12e2f3d987d1a4b6e55c5df3a6dc722b1c4f04481532afcfcc178443553ed26e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1AE49 14188 bytes