Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6bff5a1b45bc7fe…

MALICIOUS

PDF

48.7 KB Created: 2020-10-29 13:43:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: efdf02af16fb5368d08d4fc0410f82ad SHA-1: 1b893a2a7f65b01ba5d6c95d86c6cc435b7a06b2 SHA-256: a6bff5a1b45bc7fee2856d56609e0db2508fca96483113f99f36bb9a104bcc6f
154 Risk Score

Malware Insights

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

The PDF contains numerous links, with one pointing to a known malicious redirector infrastructure. The document body, though partially corrupted, includes a URL that appears to be part of a link farm designed to attract traffic. The presence of multiple embedded links and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful sites.

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://gettraff.ru/strik?keyword=pathfinder+best+critical+feats In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/4522/2062/files/kakazomu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2345fc33-38e0-4a23-8a36-563bea280452/76781616163.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/8906/0551/files/mass_spectrometry_for_dummies.pdfIn PDF document text
    • https://s3.amazonaws.com/defujo/mowak.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/7804/4833/files/ninavixagibuveribuvibix.pdfIn PDF document text
    • https://s3.amazonaws.com/lanorolowu/ravujitetubux.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7125/0333/files/30059187582.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/wandering_bone_collector_on_the_moon_d2.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3164/9689/files/11747041189.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9da286e1-13e5-4218-aa83-9bbf0fe3bcd3/nisokelirirunotetejuve.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/1634/6536/files/the_egg_story_reddit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3de64b0f-0d9a-4c90-9758-957a0d2194ce/munafevadawifipovamaru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbd45748-6331-41ab-a2c3-6e3561a5fc97/sefinidikeliremuw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9cfbe32b-0579-4746-83c5-9756910b5b1e/kelefum.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7274/9721/files/lord_of_the_flies_file.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/0960/5273/files/madoka_magica_soul_gem_quiz.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_off00007e29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E29 5248 bytes
SHA-256: 562d11b4b55b890a5bc41f48ecf423fa8eb4239c4085f31090fabf5ff6f4f29a
font_01_sfnt_off00008ffa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8FFA 11036 bytes
SHA-256: dd2a46e9cf826e9005198bb7f61769941ef0c393cb95234606aa42e3cb59f5d7

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