Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd941a21b2be6fc2…

MALICIOUS

PDF

38.4 KB Created: 2020-10-31 06:35:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: ac3cb96e4173d2d11a00361101fb4f55 SHA-1: d818c1a82daa4f965822d23e657c75b760203879 SHA-256: cd941a21b2be6fc25097dedbbff25aa30520b0f36e51a22b207b6d3296881a40
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=wii+u+emulator+android+cemu In PDF document text
    • https://cdn-cms.f-static.net/uploads/4413013/normal_5f98394b79f0f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407313/normal_5f93ab2c1fada.pdfIn PDF document text
    • https://suludizivot.weebly.com/uploads/1/3/1/3/131383823/situgamesetofilab.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/f04c0bce-22eb-400a-a60b-2a272c051210/81430791894.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/xesexotifirenifolu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b042b97d-c144-4dd3-abb7-0c70152d6dae/71474586633.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/9078/1360/files/tetirudebudoxa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/efea6cc9-3911-4bab-bc37-581d85cbf4cd/52378597235.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1474509a-cc1b-4cc2-bf54-fac31fb84430/37988738098.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57a3d9e0-cedf-4a86-9fbb-5f55311ec652/73362776180.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/gifesegeg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed072a50-63c2-48f1-9bb7-154b0c318f08/what_are_the_functional_properties_of_carbohydrates.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/748987b5-1c7b-47ab-b742-2ad46c23d8a7/tipos_de_lenguaje_en_un_guion_radiofonico.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_off0000581d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x581D 4920 bytes
SHA-256: 47f1734679e8a646c834d32b48c2222c5c00c2dbc41c8168ccbb10d3ad38ca74
font_01_sfnt_off000068cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x68CF 10612 bytes
SHA-256: dddfd500dbcee841f38d1b3f05a888ac4cbb96869f45470d117d3feffe37eea3

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