Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bf892c0fb33ca1c…

MALICIOUS

PDF

51.0 KB Created: 2020-08-06 07:50:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e0e00adc3bd2d61697b47708016ffe59 SHA-1: e65542d0cbe54b66018b569cda6561db891f510d SHA-256: 7bf892c0fb33ca1c00c9ad0527c0d985d3d6fb9c021e4506bcc32f5d4a583e27
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains embedded links, one of which points to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'ejercicios numeros primos y compuestos pdf 5 primaria' and the malicious URL. This suggests a lure to trick users into clicking the link, likely leading to a phishing page or malware download. The ML classifier also strongly indicated maliciousness.

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://ttraff.com/pify?keyword=ejercicios+numeros+primos+y+compuestos+pdf+5+primaria
    • http://files.lmcakebylisa.com/uploads/1/3/2/6/132681378/zukefikijebeso.pdf
    • http://files.s-cta.com/uploads/1/3/1/3/131398419/talekelozanasa-turudavoboki.pdf
    • http://files.fijianmermaid.com/uploads/1/3/0/8/130813528/3632766.pdf
    • http://files.fijianmermaid.com/uploads/1/3/0/8/130813
    • https://cdn.shopify.com/s/files/1/0437/7437/8138/files/fusozimida.pdf
    • https://cdn.shopify.com/s/files/1/0436/7836/7897/files/literary_devices.pdf
    • https://cdn.shopify.com/s/files/1/0435/4247/9007/files/best_practice_book_for_ielts_writing.pdf
    • https://cdn.shopify.com/s/files/1/0433/1143/1838/files/31850487506.pdf
    • https://cdn.shopify.com/s/files/1/0438/9522/6523/files/89941242857.pdf
    • https://cdn.shopify.com/s/files/1/0434/2510/4028/files/self_organization_and_associative_memory.pdf
    • https://cdn.shopify.com/s/files/1/0432/1050/6404/files/71662593984.pdf
    • https://cdn.shopify.com/s/files/1/0436/7394/4217/files/qms_lead_auditor_course_material.pdf
    • https://cdn.shopify.com/s/files/1/0431/5398/1594/files/getawobutovaxakawugetutob.pdf
    • https://cdn.shopify.com/s/files/1/0433/8620/8406/files/43307920362.pdf
    • https://cdn.shopify.com/s/files/1/0428/9508/1635/files/gitenap.pdf
    • https://cdn.shopify.com/s/files/1/0431/0115/9575/files/21777758715.pdf
    • https://cdn.shopify.com/s/files/1/0431/8468/5224/files/turaz.pdf
    • https://cdn.shopify.com/s/files/1/0431/4297/1553/files/dobemogubazazilulabo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006f38.bin
131461e696f502230a662afd955793528cef76d275e03394c6066ef1e881bef3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F38 5528 bytes
font_01_sfnt_off00008202.bin
ffb4f1f916b429988b334ee1d929c2005e50311ea3a93b0645e69595ac2a8a4a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8202 11104 bytes
font_02_sfnt_off0000a64c.bin
bf8f9ece8d9d74ce2d7a98a07ee1bb8f4056faf702b3b1702118181e85f1b939		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA64C 16312 bytes

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