Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b6402232925f903…

MALICIOUS

PDF

48.7 KB Created: 2020-10-28 22:40:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: dfcc170cae86c5b92c9e892520794b29 SHA-1: 7fd4560ba3fff2962a84a5b45d96f37311ea410f SHA-256: 5b6402232925f9034f20fd497768bd700becf7c5bf7a8eb15ba8e4feb5650a0b
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector service. The primary malicious URL identified is https://ggtraff.ru/strik?keyword=medical-surgical+nursing+review+questions+3rd+edition, which is flagged as malicious. The document body, though heavily obfuscated, contains this URL, suggesting an attempt to disguise a phishing or malware distribution lure as educational 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://ggtraff.ru/strik?keyword=medical-surgical+nursing+review+questions+3rd+edition In PDF document text
    • https://cdn-cms.f-static.net/uploads/4377642/normal_5f8b4dd2f3025.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387807/normal_5f8d2d8b2f955.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369640/normal_5f8a67feee50d.pdfIn PDF document text
    • https://vuzevarezevarot.weebly.com/uploads/1/3/0/7/130740461/3a6af17.pdfIn PDF document text
    • https://dawugagulinejud.weebly.com/uploads/1/3/4/3/134368664/2607837.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/1/0492/4188/2780/files/84435773950.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/4384/3996/files/78515204476.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0467/7763/0873/files/zovisekifojatojumule.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/7513/4135/files/5652654427.pdfIn PDF document text
    • https://s3.amazonaws.com/mesotodimus/araku_valley_travel_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0495/1421/7638/files/neneg.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/45481670089.pdfIn PDF document text
    • https://s3.amazonaws.com/sitok/algebraic_expressions_grade_9.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aabba1bf-a1ef-4b24-b201-7f3a7a097aef/dbt_skills_manual_for_adolescent_handouts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b656bd2-5f91-4e55-bf6d-527cad2bf25f/patologia_robbins_10_edicion.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/2012/1760/files/ledavijakaxaden.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15e24705-e396-4198-a22b-2c5c7be25cff/ley_29783_en.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc503e46-322c-4718-b2e0-bdeed936d5f8/31276213625.pdfIn PDF document text
    • https://s3.amazonaws.com/fopalew/xutisera.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/dairy_wastewater_treatment_plant_design.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/2969/0530/files/brocade_vdx_6710_configuration_guide.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_off00007b3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B3D 5588 bytes
SHA-256: 9db213a1451721fedd1c6873387733b614bee56c6509d71792d061966c57cd49
font_01_sfnt_off00008e67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E67 11264 bytes
SHA-256: 3fb496e2cde043dacb906e98d692ab76fddf5444e659b5bc0c8a085967e641f3

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