Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7746726476c853c…

MALICIOUS

PDF

50.6 KB Created: 2020-11-01 21:11:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 97efe0e13856d418ff990d918d45ada2 SHA-1: 9aecee3c7b217e72a4efaf2daa22b843c55e119e SHA-256: b7746726476c853c0c5d9bde13c90aee4de80e8c400a5abef3f22f7bf40ffb9a
124 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, specifically a URL designed to appear related to 'Red dead redemption 2 horseman challenges'. The ML classifier strongly indicated maliciousness, and the document body, though heavily obfuscated, contains a reference to the same lure and a malicious URL. The presence of multiple disposable hosting domains and redirector links suggests a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://ttraff.link/123?keyword=red+dead+redemption+2+horseman+challenges In PDF document text
    • https://vuguzakinizole.weebly.com/uploads/1/3/4/4/134493236/a895bc00837aff9.pdfIn PDF document text
    • https://tibiwurab.weebly.com/uploads/1/3/2/6/132695994/gazuxusuwamoselub.pdfIn PDF document text
    • https://jederatikepu.weebly.com/uploads/1/3/4/3/134370591/a218ae44992.pdfIn PDF document text
    • https://nijubalalo.weebly.com/uploads/1/3/1/4/131453980/5849346.pdfIn PDF document text
    • https://xoxujodega.weebly.com/uploads/1/3/4/3/134363828/puwikazo.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/aortic_aneurysm_ultrasound.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/wazitedatamifaxa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/7234/8870/files/609313456.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b2a378d-6465-4ea3-bad2-e06ab39328bb/megimiwojodif.pdfIn PDF document text
    • https://s3.amazonaws.com/tedowafomaru/henkel_harris_desk.pdfIn PDF document text
    • https://s3.amazonaws.com/juvuraguvutoxif/epidemiologia_de_cancer_de_mama_en_mexico.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/20516631984.pdfIn PDF document text
    • https://s3.amazonaws.com/kiwopusafize/buziti.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/0376/7713/files/ncis_la_season_8_episode_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b059582-cba2-4149-b80b-44e21457574f/juwixufivimajeka.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_off00008409.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8409 5624 bytes
SHA-256: 3060b23f2d74cbcc91512da077ee95ef66c2ffcb13f7269c5e1ee49717569f7c
font_01_sfnt_off00009705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9705 11068 bytes
SHA-256: 78ea344106bbc0b314b9306f630c6f02c77866959248e0bcaf5590699db1af18

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