Malicious PDF — malware analysis report

Static analysis result for SHA-256 3efbde3e42ccc878…

MALICIOUS

PDF

40.4 KB Created: 2020-10-08 16:59:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: a3b4966de94d2fb0fa0ed99e8e821fd0 SHA-1: 925beeb6e4c866249ef3922452f8e05ce7b9dba8 SHA-256: 3efbde3e42ccc878031a1d21e6d577a18a075ca3accd9d43bbcb4b0649dfda4f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector, suggesting an attempt to lead the user to a malicious site. It also hosts a large number of external PDF links, indicating a link farm designed for SEO manipulation or to obscure the malicious destination. The ML classifier strongly flagged this PDF as malicious.

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.club/pify?keyword=king+air+c90+manual+pdf 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/acfc9227-59c3-43ed-8ab4-d90ea16db1d2/zamovevixefer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ec330b9-4af6-4f56-afb3-b2b68f56f927/risusimivasikuze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20aa42b8-b920-400a-8cdc-fd39650478c6/maxikig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ced853e-d2c8-4292-9aee-0163e8f8c556/divekerelub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96a70a4e-7b39-4b8f-be66-6bfe4303e1ae/64610280286.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/1522/7557/files/how_to_make_a_table_in_overleaf.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/0601/6669/files/what_do_animals_eat.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/4406/4408/files/kugane_castle_tank_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2259/7800/files/pisiwiwesexunina.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a702ae08-ee7f-4dc4-8439-abfcd4729160/dasexovizixavada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ab6b8bf-8cdb-472e-b328-6f0af0f04c33/tevitejifoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6809891b-0a9f-4c52-b14d-06e2b76b9197/62043832240.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_off000051bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x51BC 5564 bytes
SHA-256: 90cd1649f90b7cf4f316ed5cedfda8ec4cf790c25ebd4682abbb4ef12ec67202
font_01_sfnt_off000064a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64A1 14844 bytes
SHA-256: 64ec7e57cdcf6dd708dbcc1659b54f0aea0f3b92513f784c3cee972733e42482

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