Malicious PDF — malware analysis report

Static analysis result for SHA-256 eef4d6bacabf9cbf…

MALICIOUS

PDF

41.2 KB Created: 2020-10-30 00:58:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: bbdbe7eb12ecc716c4a58316aa756851 SHA-1: 90961b0c89515d5aadb94d6ba48612cbd6706a58 SHA-256: eef4d6bacabf9cbf5d591198c83831a6d4c272c25c2e4adec6710229f41199ea
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded links, identified as a link farm, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'algebra lab recording sheet answers' and the malicious URL, suggesting a lure to disguise the malicious intent. The ML classifier strongly indicates maliciousness, and the presence of multiple external links supports the SEO link farm heuristic.

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 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.
  • 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.ru/123?keyword=algebra+lab+recording+sheet+answers In PDF document text
    • https://xanugobolenaz.weebly.com/uploads/1/3/4/3/134371028/lifasa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417313/normal_5f9a6bd51b869.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372735/normal_5f989aa7a14d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369504/normal_5f8815c8b872b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367299/normal_5f8c6d16aed63.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/78b33540-9f9d-4e0d-b436-295315bc4d22/69001502206.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e8484f1-144e-4714-8e9d-6a2c3af4bf99/vewlix_arcade_cabinet_plans.pdfIn PDF document text
    • https://s3.amazonaws.com/kuboki/reddit_amazon_prime_movies.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe0f4793-1b98-4f19-88b0-f6c3120f9a71/rifokojiwule.pdfIn PDF document text
    • https://s3.amazonaws.com/mesotodimus/tumukibunejijuxufifo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/7907/3436/files/jisigefiwozizusemewoku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84308a52-4a06-4d16-91f7-7e78089d0bd8/wononesonovokeposavobuda.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/3d_pencil_drawing_techniques.pdfIn PDF document text
    • https://s3.amazonaws.com/gopuze/2.7_prove_angle_pair_relationships_worksheet_answers.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_off0000611c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x611C 5424 bytes
SHA-256: 1b0791dc1b3089c4fdf82f301fbc83ceb6a4dba001ddb13c7354590124becc2a
font_01_sfnt_off00007391.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7391 10748 bytes
SHA-256: f59775a1cdb34a2e8a294e4acc2fe8315dad32f1c111d731e740183f688507ba

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