Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d23d2981b034f7f…

MALICIOUS

PDF

40.0 KB Created: 2020-11-06 12:42:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 7b55fb69e90b47c4195a4913ebf4d4c9 SHA-1: d289f1e923497601f16fd6333ba1460b3e07db33 SHA-256: 8d23d2981b034f7f818a7fd1eaf52c51f566b2cae773f17a1d53271e70b7c9be
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains a large number of embedded links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various external URLs. One of these URLs, https://trafffe.ru/aws?keyword=area+code+32217, is flagged as suspicious. The document's structure and embedded links suggest an attempt to manipulate search engine results or redirect users to potentially malicious sites, possibly as part of a phishing or content-farming scheme. No scripts were extracted, but the extensive linking behavior is indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafffe.ru/aws?keyword=area+code+32217 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366024/normal_5f873d1e014db.pdfIn PDF document text
    • https://pudufanosi.weebly.com/uploads/1/3/4/3/134324904/vediguwok_burok.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382003/normal_5f8d61f3e9695.pdfIn PDF document text
    • https://sazalilo.weebly.com/uploads/1/3/4/5/134592982/4295782.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/8d1184ef-1e38-4357-838c-0234d730b216/20383667777.pdfIn PDF document text
    • https://s3.amazonaws.com/fefurorobumi/vesagubipewatevaludipebev.pdfIn PDF document text
    • https://s3.amazonaws.com/zakunafu/pokij.pdfIn PDF document text
    • https://s3.amazonaws.com/zinudipir/81289816354.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83e47191-9ca6-4a0b-897f-513f43a366ef/81205661783.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/business_process_modeling_simulation_and_design_second_edition_download.pdfIn PDF document text
    • https://s3.amazonaws.com/tuzamada/femur_and_tibia_ratio_effect_on_running.pdfIn PDF document text
    • https://s3.amazonaws.com/jofunoje/lodajifawavugorixap.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_off00005e26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E26 5140 bytes
SHA-256: ff30c5230e3be28d0c64fd8f5d694fd04e2534bcbc2e8decbc715a15adc8f373
font_01_sfnt_off00006fba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6FBA 10596 bytes
SHA-256: ac6e6016d137b4a7fb5dcbafe3f6c7aae5f58088462034ff2559aa037e339ea1

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