Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c3f50c26c03492f…

MALICIOUS

PDF

41.8 KB Created: 2020-11-02 21:51:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 21541e705c33397064a192cd81e78a68 SHA-1: d860ee61252ab1fb9bb875fc1f2c28276bd317ff SHA-256: 2c3f50c26c03492f95435f60e01f0c78314a7f2f4cec2449f7bf7706206608f0
162 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=the+living+earth+app In PDF document text
    • https://cdn-cms.f-static.net/uploads/4382418/normal_5f9e932f8bd62.pdfIn PDF document text
    • https://wefolukozik.weebly.com/uploads/1/3/1/4/131406413/xogajivug.pdfIn PDF document text
    • https://nunoperiv.weebly.com/uploads/1/3/1/8/131856708/2c439.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382429/normal_5f8df657a3495.pdfIn PDF document text
    • https://suvibumaluri.weebly.com/uploads/1/3/4/4/134458401/sezutigar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366969/normal_5f87c6d928553.pdfIn PDF document text
    • https://dovasuseburipir.weebly.com/uploads/1/3/4/3/134394860/6949728.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/6038bec0-c370-419d-9bdf-3a89084b0bbb/zabewofejofa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56f446c8-4819-4301-90e7-b6e3bb89cc88/84858234122.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0fbd52b-7e5b-4bc2-8b33-49c17d62311a/83577236991.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db2f191e-f82e-487a-bc78-40d065a90855/cancro_al_seno_triplo_negativo_allo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/694d148c-f378-4be4-88a1-ed8418688c42/hells_vengeance.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_off000066df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66DF 4912 bytes
SHA-256: da99d879e2a22857458e0a01e169a25262af46193bcb78470c7292da23ad7196
font_01_sfnt_off00007799.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7799 10304 bytes
SHA-256: a70bbb964545898efac4ad83232299bd002f54fe9616cf0a8774a1d0644043ca

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