Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d3df9da3e8b217b…

MALICIOUS

PDF

46.2 KB Created: 2020-11-01 02:14:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 80c0543ce254343fd40817b3d2142e1e SHA-1: 3a5ba039aafc1dd3e66418c13ebd6c31cf71c48c SHA-256: 9d3df9da3e8b217b2d23dd513319f316c1f64bf754a3e4ffd2d5509b03e6124c
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a link farm and a direct link to a known malicious redirector, identified as 'ttraff.ru'. The document body, though heavily obfuscated, contains text referencing 'Usps nonprofit bulk mail form 3602-n1' and the authoring application 'wkhtmltopdf', suggesting a lure to trick users into downloading or interacting with malicious content. The ML classifier strongly flagged this PDF as malicious.

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.ru/pify?keyword=usps+nonprofit+bulk+mail+form+3602-n1 In PDF document text
    • https://bewupoterefi.weebly.com/uploads/1/3/1/3/131380107/678a2b171.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/tuxenipup/90704201098.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/951fd67b-39b0-44ce-8053-32282050124d/vlc_android_apk_mod.pdfIn PDF document text
    • https://s3.amazonaws.com/fenatagazise/algebra_formula_in_hindi_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44e1f688-5382-44be-ba29-d8e7412a7d03/35595558500.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dcd1f754-73c9-4df3-b6d1-12da7afc0405/ganojolexejo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5378585b-571d-47f6-b6ff-264c540ea51a/napaseserufunofomaregef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce47e4f1-3959-43d7-8aad-cf5d589cd595/ver_dr_house_online.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/konivofazujegobo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a546f725-2734-469d-b686-56fbc41be402/a_spys_guide_to_strategy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/108dc284-ec05-4239-856c-9d435e7ebf57/1542760087.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000067b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67B9 5680 bytes
SHA-256: a8e364cf1b0d5bb0dd3b9c010530ab2603f5fe61800a65774cdfce9ee15237a0
font_01_sfnt_off00007aed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7AED 10144 bytes
SHA-256: bcb8cfeb4426893586a9ad77c2767e7e77d55f66d1998a75f100fec1cd52b2c7
font_02_sfnt_off00009da4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9DA4 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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