Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a56bd0cfc135d00…

MALICIOUS

PDF

44.5 KB Created: 2020-11-02 20:09:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 28f3d4e1dbb44319e50ff1cd0bec93ce SHA-1: 11a4dabbccab9537d0e55d63b6c9bebdd57a9859 SHA-256: 7a56bd0cfc135d00aa179f10bcdc662fef8b8615c17e2a1d9b36e137fa3fbb75
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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.com/123?keyword=club+penguin+mission+7+cheats In 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/724914a0-8c69-4f9a-a9e2-24499fab74a0/domose.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/4454/7991/files/air_compressor_maintenance_service.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0478/6834/6534/files/46853674445.pdfIn PDF document text
    • https://s3.amazonaws.com/lodazojamuva/holistic_approach_in_learning.pdfIn PDF document text
    • https://s3.amazonaws.com/vexeliku/15369315770.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/1131/6131/files/nexewarimemaxukavawori.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0923/6374/files/fce_use_of_english_answer_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a60e1f6e-8ba9-42c0-aab7-1cf51e5dd26a/baroreceptors_are_located_in_the_novella.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/2248/2101/files/rijeduregoliwax.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/7245/2776/files/bakumatsu_crisis_sub_indo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/875316f4-b521-4fde-81a9-c12ffb37943b/68359067623.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5f5eb6d-3711-4e09-8fbd-5f7b647b7c72/70067368446.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5474/3200/files/geforce_experience_won_t_update_drivers.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006637.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6637 5376 bytes
SHA-256: e0b6cb11821149eb554cbbd66ff7b9ce6d23f759f106160bc313fb07c9358ed1
font_01_sfnt_off0000785e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x785E 1800 bytes
SHA-256: e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d
font_02_sfnt_off000080ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x80EC 11120 bytes
SHA-256: 336944e338720219b3d14ab8096dffce549b4aadcfa4f8167253d45707b6e4c2

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