Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b3a1fd3847c34fb…

MALICIOUS

PDF

40.4 KB Created: 2020-10-14 17:19:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 85121458a38127716cac64284a9d11d0 SHA-1: 2c6466e108179320f298ac06bef6e08879c6ea22 SHA-256: 6b3a1fd3847c34fb60b594d8d03e7691589376ea0e8f48298089191588a1cf3d
154 Risk Score

Malware Insights

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

The PDF contains embedded links, with one identified as a malicious redirector. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK and ML_NYX_PDF_MALICIOUS strongly indicate malicious intent. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector, suggesting an attempt to lure the user to a compromised site. No scripts were extracted, but the presence of numerous external PDF links points to a link farm or SEO manipulation tactic to distribute malicious content.

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://gettraff.ru/123?keyword=audi+a4+self+study+program+pdf In PDF document text
    • https://site-1037059.mozfiles.com/files/1037059/23583745505.pdfIn PDF document text
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/b919b1ed8f.pdfIn PDF document text
    • https://jawasolasazilem.weebly.com/uploads/1/3/1/3/131379174/xopevu_vilugarokobijos_fimorekon.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/1/0480/4231/1839/files/36090353959.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5794/6530/files/5801875464.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/7882/3317/files/masterchef_uk_season_15_episode_9.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/9607/5159/files/79405174916.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/8293/5189/files/58735875998.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/9720/1567/files/34313980776.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/7125/7241/files/does_protein_powder_go_bad_in_a_hot_car.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/3237/5207/files/one_piece_opening_13.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9773/5836/files/rubopimagi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8006/4936/files/twilight_princess_manga_volume_5.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb27134a-96e5-43c6-9fc1-9a06d4787712/tabefutinogapojin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d306245c-7edf-4b8a-a57b-aef6df7f6bb2/82864526161.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fabc5af-e62c-408b-9014-d2f9ca9eec64/66718904905.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_off00005f48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F48 5540 bytes
SHA-256: f25cbc789c13432f8fea6f49dd2b57426b521f829ca3b25c4bfc1466bedbb83f
font_01_sfnt_off0000721e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x721E 10200 bytes
SHA-256: 481fb8a2484ef33b79849126db5984608d64786ba61242a2f3002c3cf1a64cd0

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