Malicious PDF — malware analysis report

Static analysis result for SHA-256 e34ed6d1fab85047…

MALICIOUS

PDF

45.7 KB Created: 2020-11-03 09:05:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 0a816f9a8931bfaa16756ca9a3ff5d68 SHA-1: 9bfc4c9d04bc74b1dab1ad42ccbd60f1b39dbd1f SHA-256: e34ed6d1fab850475dd8024068b045c2a55d561cf7d96f3d0fea96cf315a012f
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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/strik?keyword=almacen+translate+to+english In PDF document text
    • https://zigegawemofeza.weebly.com/uploads/1/3/1/4/131406932/603773.pdfIn PDF document text
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/wogiselaruto-nokage.pdfIn PDF document text
    • https://tedinuvade.weebly.com/uploads/1/3/4/3/134348171/pufipurokiralopiw.pdfIn PDF document text
    • https://jopalezaleloloj.weebly.com/uploads/1/3/1/3/131380469/tufegetebajixil.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446285/normal_5f9f10abf1bcb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/492e5d3d-42a3-4a85-a94a-1340a6db1057/zisame.pdfIn PDF document text
    • https://s3.amazonaws.com/dixaleko/engineering_your_future_8th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be310a82-1b99-41ee-a3d9-d4b209f9afb2/97586049980.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0700eaa-5db3-40c3-9817-61b8468e763e/84139289477.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/6038/6709/files/digowusaxurixisedegifejo.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000752c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x752C 5204 bytes
SHA-256: 8e32d2657d3a27962bdb09e6f28b1e825208ab22254e916fe713d09a8f89aa7c
font_01_sfnt_off000086ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x86AB 10656 bytes
SHA-256: 15fce26052309b008126deb656b4cd2da34bf58a63766f411503fab44476f6bf

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