Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e0375e82c29d805…

MALICIOUS

PDF

39.7 KB Created: 2020-10-08 11:42:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 8569b08c671d91b652ba0b8592827d6c SHA-1: 92ad7772a401c956cdccc1de36406cce744a89ef SHA-256: 8e0375e82c29d80501ebeff4d747d294bdffe61985bf8ed5a2ac9acfd398b6ac
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with critical heuristics identifying it as a malicious redirector link and a link farm. The ML classifier strongly indicates maliciousness. The embedded URLs likely serve to redirect users to malicious sites for further exploitation or malware distribution.

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://cctraff.ru/pify?keyword=algebra+1+pdf+book In PDF document text
    • http://files.definitief.shop/uploads/1/3/0/7/130775107/kujiresikote.pdfIn PDF document text
    • http://fuzosago.marisths.org/uploads/1/3/0/7/130739206/c745fc6.pdfIn PDF document text
    • http://files.wesawa.org/uploads/1/3/2/6/132681796/3836122.pdfIn PDF document text
    • https://site-1048190.mozfiles.com/files/1048190/54036894850.pdfIn PDF document text
    • https://site-1039665.mozfiles.com/files/1039665/44876134577.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/11e65410-0d3d-4ada-90f3-a6a8edf5ce31/sodipuzomatevu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bef09531-0fe2-4d89-92e4-f2cd5751dbfb/baluduvesis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0cc00a2-de4d-47cf-8977-87e3f0b86738/51659961021.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/759a5fa3-f6dc-48a7-b632-62b13b02ec5f/robinipexesusaxunenepuvut.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/9723/4338/files/pricing_procedure_in_sap_sd.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/4006/5694/files/latojimuxebofekukibunib.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_off00005cea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5CEA 5276 bytes
SHA-256: d1a8716f434fdd312ec48e0d0bf088ffb642bf61619176d1140ebb32357fc699
font_01_sfnt_off00006ef5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6EF5 10512 bytes
SHA-256: 2d48534742bbceddf57ac6a427b090d14885084313e2ed46339810e909d430fd

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