Malicious PDF — malware analysis report

Static analysis result for SHA-256 cefc7fb72bc6ce0a…

MALICIOUS

PDF

35.6 KB Created: 2020-09-21 01:41:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 27b999476eca6f907da4d7e40a4f5eec SHA-1: 8a7abfd76baf2ae56c84dad3d61a7cabfd7eb06e SHA-256: cefc7fb72bc6ce0a5272495305cc71b3eab580e559d36ddd02eac04c5e00b404
154 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics for containing malicious redirector links and a large number of external PDF links, indicating a link farm. The ML classifier also strongly indicated maliciousness. The document body contains a URL that matches one of the identified malicious links, suggesting the document's primary purpose is to redirect users to potentially harmful 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://ttraff.club/wix?keyword=guess+up+emoji+answers+level+273
    • http://ridudaza.janneverard.com/uploads/1/3/0/7/130775766/rogifisusexom-kalupo-giwekevir.pdf
    • http://files.baltimorecityscape.com/uploads/1/3/0/7/130775292/nevid.pdf
    • http://files.profisor.com/uploads/1/3/0/7/130738548/robar-netogatubol.pdf
    • http://files.bedfordwoolnh.com/uploads/1/3/1/3/131380052/4042034.pdf
    • https://e7519581-2b0f-4c91-b3e7-9f1504d0dcc9.filesusr.com/ugd/0c8cc8_4bb26e4bede54874b16b05bd4c360b2c.pdf?index=true
    • https://c4b924c2-a06b-4cbd-acd2-45edfc84b62c.filesusr.com/ugd/65d6f7_5909b67a407c41dca9d583377f7f0184.pdf?index=true
    • https://28c35288-8fe0-44e8-a08a-37ce426c9e87.filesusr.com/ugd/4ca7f5_2715bc8a3c1d43f1a83becfc5de9e122.pdf?index=true
    • https://f08144f0-d115-475b-8591-65f3d7f349a1.filesusr.com/ugd/8aba0c_9c8d9d83e8fe4518a356c6efa915b55f.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0428/7817/3343/files/tebevijibewi.pdf
    • https://cdn.shopify.com/s/files/1/0434/6658/8325/files/emulsion_polymerization_review.pdf
    • https://cdn.shopify.com/s/files/1/0459/0269/2506/files/medical_terms_crossword_puzzle_answers.pdf
    • https://cdn.shopify.com/s/files/1/0428/8145/0147/files/14763782400.pdf
    • https://cdn.shopify.com/s/files/1/0431/3546/7682/files/jojo_fighting_gold_piano_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0429/1421/8143/files/11907128714.pdf
    • https://cdn.shopify.com/s/files/1/0482/8122/3336/files/77363871831.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004cd4.bin
174673653031de647b268107def59ac8dc986b4154dd24f65bac8a6995827f7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4CD4 5600 bytes
font_01_sfnt_off00005fea.bin
6580b1ab64bab49d07534f98c1f0abc80a7f4b560ffe8b78fab0d6d238b72c4f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FEA 9908 bytes

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