Malicious PDF — malware analysis report

Static analysis result for SHA-256 73915f3e6d9284af…

MALICIOUS

PDF

50.5 KB Created: 2020-11-05 23:18:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 4da93e8e333ad08af6beddb8d5e178a1 SHA-1: 9d5cd34bffa2af30f4781e7acf3b3d5e76c52a05 SHA-256: 73915f3e6d9284aff84103d0e1600416893191dd992a2befde866e1774ee201c
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by a machine learning classifier and contains numerous embedded links. Several of these links point to known redirector infrastructure or are hosted on disposable domains, indicating a link farm designed to direct users to potentially harmful content. The presence of a link to 'ggtraff.ru' is particularly concerning due to its association with malicious redirectors.

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/123?keyword=football+usc+inside+scot+wolfe In PDF document text
    • https://vinemexip.weebly.com/uploads/1/3/4/3/134306635/3952796.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367650/normal_5f8b0f4f90a8e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413475/normal_5f97e9a8c5799.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443326/normal_5f9eec25a5221.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366388/normal_5f899a5f20b45.pdfIn PDF document text
    • https://zoveponezewuda.weebly.com/uploads/1/3/0/7/130738822/sefimas.pdfIn PDF document text
    • https://lakupemeza.weebly.com/uploads/1/3/4/2/134235705/zinavopugos.pdfIn PDF document text
    • https://meboguvogo.weebly.com/uploads/1/3/1/4/131437667/jiwaputimi_virijiziwadew_refudufa.pdfIn PDF document text
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/wowabaxisefidet-nikuvajekibesim-napoxalapa.pdfIn PDF document text
    • https://zivawopoxiba.weebly.com/uploads/1/3/4/3/134355714/7772213.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388825/normal_5f9c5548602f6.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/c0cb132e-f5d7-494d-b273-5c477d505317/58884478297.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ceef5bff-307b-4e6a-b4f1-2f085e5664c8/99527309867.pdfIn PDF document text
    • https://s3.amazonaws.com/vetamedisoz/16570101792.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_off0000869b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x869B 5108 bytes
SHA-256: 4fce59c83438cbfcdc637c73b38d92e3981fc6f32f5404cc4e4de037f724a30c
font_01_sfnt_off00009824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9824 10948 bytes
SHA-256: b2514ef9c1e61ad0783a91bd04f3f754d1776245f632afbcdeba39dd6f1258bc

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