Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d347e1cc2c990d1…

MALICIOUS

PDF

48.8 KB Created: 2020-11-01 18:14:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: d6b710273420c3c7858c2319c8efb7e2 SHA-1: df2a88d6d3678ee82418992def059ff2586aacc6 SHA-256: 4d347e1cc2c990d178a7df76c5de09e5b53641c7ec3b1ead490021632aa514b3
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.link/123?keyword=network+based+statistic+matlab In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366335/normal_5f890f661359e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376600/normal_5f908d5455321.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409257/normal_5f986958722c1.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/4e0056a3-fcad-45f9-a5b9-a727af9f0c91/nujotekizakibapekoxi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1fc2f76-3e15-4c10-8174-c2c3b0908ac6/jefavetibixotesa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4072/6431/files/raw_apk_showbox.pdfIn PDF document text
    • https://s3.amazonaws.com/woberiz/7668363047.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/4705/9108/files/youll_be_in_my_heart_ukulele.pdfIn PDF document text
    • https://s3.amazonaws.com/turip/30163684693.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ece4446-1299-48a2-9036-a11c54bdb391/71688769226.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/5699/4725/files/ratification_of_the_constitution_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/0644/2653/files/53938513679.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/0806/5191/files/innovation_management_textbook.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0159/3502/files/pufaxojezepilu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/5518/3537/files/password_protected_to_normal_online.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_off00007ed9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7ED9 5352 bytes
SHA-256: 91cc13b2a1f8477ba471609d00542e949443512caff63c551ab45b602fb0ecfe
font_01_sfnt_off00009108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9108 10960 bytes
SHA-256: 3cb240081f06d38fc8edc177f7a6c686c29074ccdd2282511e4f99778d6fd6ff

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