Malicious PDF — malware analysis report

Static analysis result for SHA-256 495be774dfcce531…

MALICIOUS

PDF

43.4 KB Created: 2020-10-29 01:48:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 79b32e0bc793d0d503cb8c0ef8f41fb7 SHA-1: da5ccd0b59ce2a8e379992a8b5bd216c718f7b62 SHA-256: 495be774dfcce5312c6290a51dc2b6dbbe19c239113418349939bb06971c0c8f
154 Risk Score

Malware Insights

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

The PDF contains embedded URLs that point to a known malicious redirector infrastructure, specifically `https://cctraff.ru/strik?keyword=apply+properties+of+rational+exponents+worksheet+answers`. This redirector is likely used to deliver a secondary payload or phish for credentials. The document body, though garbled, contains the same URL, suggesting it's the primary lure. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://cctraff.ru/strik?keyword=apply+properties+of+rational+exponents+worksheet+answers In PDF document text
    • https://cdn-cms.f-static.net/uploads/4384642/normal_5f8e8704771fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386622/normal_5f914d4ec664d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368956/normal_5f87ec582c32b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379369/normal_5f8a6c8c926c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410965/normal_5f9a007ebf36d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://s3.amazonaws.com/fasanag/57057903089.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/724b339f-5661-4260-bd12-934fda124ac1/41732412299.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5440/7580/files/66_degrees_north_of_the_equator.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40323b6b-04e2-439f-9cea-050e3cc513e4/nusujo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c10f2f94-ed23-40f7-b5c4-c16269bc66ac/xijesurodabule.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/967e85d2-867b-4405-9ea0-66c2c2338246/15870686357.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7920e546-23a8-420a-999f-c3378a4bb9b4/61167752141.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07795b71-deb3-412e-9e03-fbe4fe08bc88/13209192474.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/5076/1892/files/28088501244.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/0033/0911/files/jojujisajiduluxivudajo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c67dcaa-b1f6-48c1-a27d-f4ad1643a350/2004_mustang_gt_deluxe_specs.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4876/2529/files/cooking_class_gift_certificate_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/322ca8ed-71ab-4051-befe-2196f6b3600f/lejupavesoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a42311a8-9d70-4a27-af3f-a98e68958a69/40779134255.pdfIn PDF document text
    • https://s3.amazonaws.com/dukexajuj/tamil_calendar_2019_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02859a67-3c4f-4e02-86aa-3bfead13a230/free_label_printing_software.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7da24133-1d87-4c99-8159-adceef934fee/getalupuwejuxudepupom.pdfIn PDF document text
    • https://s3.amazonaws.com/nalifij/descargar_libro_los_anunnaki_creadores_de_la_humanidad.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/3173/9033/files/murefu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/085d307d-14f0-495e-914c-7ccebad83ff9/20500344251.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/30185940968.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa685ae3-4d8c-4392-8132-ee9331a0e8a0/rifajaxewaroz.pdfIn PDF document text
    • https://s3.amazonaws.com/lovetijif/99856263708.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
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000057c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x57C2 5304 bytes
SHA-256: 1981d4ae707fdc185f30f3e807c3d56b7355d7397e69bd079e83ca2c1e3e797a
font_01_sfnt_off000069d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x69D9 7644 bytes
SHA-256: 00d9382427fca2aab539a31c03b0e257fb21d54e464bd537f8f67d65dbd407ab
font_02_sfnt_off00007e7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E7F 9488 bytes
SHA-256: 2e8a6c90f112604de08c7065078ba674aa73f8e24eac029d3bb3b8eb0274a496

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