Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b747a6c299b7c60…

MALICIOUS

PDF

32.7 KB Created: 2020-10-10 07:01:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 28a64bf73d2945e81acade4134e2fae2 SHA-1: 99efb889b54bec4fb288bd05f1d1a41914ec604e SHA-256: 8b747a6c299b7c6018aa7305fe55279e46a4a17b18ec78a8e5cb189ebec004de
154 Risk Score

Malware Insights

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

This PDF document contains numerous embedded links, with one identified as a known malicious redirector. The document body also contains a link to the same malicious redirector, suggesting an attempt to direct users to potentially harmful content. The presence of many external PDF links, some with numeric slugs, indicates a potential SEO link farm or a method to distribute further malicious 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://cctraff.ru/strik?keyword=strike+force+kitty+last+stand+friv In PDF document text
    • http://vesosiziw.mudgeeyogacentre.com/uploads/1/3/1/4/131406736/duludulumo-wemutu.pdfIn PDF document text
    • http://gikajekor.monrealbridal.com/uploads/1/3/2/7/132740292/ab4a78e.pdfIn PDF document text
    • http://files.bavarian-opera-academy.com/uploads/1/3/1/4/131454207/lefejukunagu.pdfIn PDF document text
    • http://files.bbsimon.com/uploads/1/3/0/9/130969291/dinetovenedo-sawagavo-tulelobulidaxu.pdfIn PDF document text
    • http://tuboro.leahgracefit.com/uploads/1/3/1/3/131381910/9ac45a737a32aa.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/1/0432/0978/5512/files/section_8_inspection_checklist_nyc.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4975/3493/files/pokemon_x_emulator.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/8340/8571/files/xomogokoburewikofepoti.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4040/6684/files/blue_collar_brilliance_summary.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/9350/3384/files/patricia_briggs_cry_wolf.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1568/3743/files/4chan_western_erotic.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7950/7880/files/russkaya_sluzhba_novostei.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_off000043d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x43D3 5344 bytes
SHA-256: 809cbba072cc2d5669713acec1b93ad1e51e33874e8034f39722920591ac4d99
font_01_sfnt_off00005623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5623 9432 bytes
SHA-256: 2a4c3ea6febbe0b73c597c77a7de0bd72d30984a28bc9291b4c64da3a3cfa2db

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