Malicious PDF — malware analysis report

Static analysis result for SHA-256 d359e10f3bb939d8…

MALICIOUS

PDF

38.6 KB Created: 2020-08-10 12:10:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 221dec06099d0fc44c028a9a5c5e9854 SHA-1: 2ab4d557bb18cb8fe4ea2c77e5e9d890d0280b69 SHA-256: d359e10f3bb939d8de6dab8c1c04209108dea74bc75f838629734b51f8d8b45a
154 Risk Score

Malware Insights

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

This PDF document contains numerous embedded links, many of which point to external PDF files hosted on various domains, suggesting a link farm or SEO poisoning tactic. One prominent URL, 'https://ttraff.com/pify?keyword=4th+grade+spelling+words+common+core+pdf', is identified as a malicious redirector, indicating an attempt to lead users to harmful content. The document body, though heavily obfuscated, also contains this malicious URL and other benign-looking PDF links.

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=4th+grade+spelling+words+common+core+pdf In PDF document text
    • http://files.thedepontes.com/uploads/1/3/2/7/132712315/ferazafof.pdfIn PDF document text
    • http://fomutudo.stmanvel.org/uploads/1/3/0/7/130776644/476ab0.pdfIn PDF document text
    • http://files.alexjbass.com/uploads/1/3/1/4/131408204/pulej-bigavavubonunor.pdfIn PDF document text
    • http://files.flourandwaterbaking.com/uploads/1/3/0/7/130739678/501225.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/1/0432/6467/1909/files/jivix.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3542/5944/files/vunebuxi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8948/4189/files/11090755617.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/0086/3643/files/puwot.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3431/1845/files/61303888641.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1871/4264/files/kptcl_je_exam_question_papers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/7029/9038/files/poxukikiziv.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/6204/8421/files/losetuput.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/8881/9864/files/historia_de_los_aines.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_off000057fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x57FC 5656 bytes
SHA-256: cfb21001015b3e7a1b3027d8f922b08bd1fcce5ed8e380577b11ab82d4fc3c33
font_01_sfnt_off00006b2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B2A 10104 bytes
SHA-256: a27ffd63d9f99d3a70fdddcab39727c090592b1d43adca78d70bf4908e8f776a

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