Malicious PDF — malware analysis report

Static analysis result for SHA-256 5911c4c4a1f1ce88…

MALICIOUS

PDF

42.0 KB Created: 2020-11-03 05:50:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 83c5966f09b53c4e7b2f141bf0193a58 SHA-1: 394332e820956822d9d3dcc13d70614f4e10edaf SHA-256: 5911c4c4a1f1ce880bc1ebf4b5ce79753c0c4ae5c04266740e63cf84b9a0b2eb
154 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to potentially malicious infrastructure. The document body, though partially obfuscated, includes a URL that is flagged as a malicious redirector. The presence of numerous external PDF links suggests a link farm or SEO poisoning attempt, aiming to drive traffic to malicious 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://cctraff.ru/strik?keyword=exposition+in+the+book+to+kill+a+mockingbird In PDF document text
    • https://lixaworone.weebly.com/uploads/1/3/1/8/131871871/2887594.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408186/normal_5f967d49eec42.pdfIn PDF document text
    • https://toreliga.weebly.com/uploads/1/3/4/3/134335880/xigugu.pdfIn PDF document text
    • https://xuzutewoduka.weebly.com/uploads/1/3/4/3/134364923/9642758.pdfIn 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/1/0505/1996/5880/files/download_game_anger_of_stick_4_mod_apk_unlimited_money.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0813/0213/files/zumilowire.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9692/3543/files/pride_of_iowa_cookie_recipe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3239/5423/files/little_hotties_thermal_insoles_how_to_use.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81282e24-600e-4bf6-a989-902ff5cfa3a2/12974212702.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf6f4356-7d64-4f1c-889e-d38dd21bd002/68599115198.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0491/5540/8071/files/zulube.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/582a259c-b330-46ee-8491-ba096e7c8bb7/it-201_d_form_2018.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_off00006544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6544 5716 bytes
SHA-256: 1b231b4e53b47b6a64057eb68f498a451e0d74c6a9fb414228122aa41c54d164
font_01_sfnt_off00007888.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7888 10176 bytes
SHA-256: fc42b2b411bce4fa265ee199248b5e77e0d016aa7e3df3e3d615a79e1ac9d315

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