Malicious PDF — malware analysis report

Static analysis result for SHA-256 0eb2886ecb56f855…

MALICIOUS

PDF

73.9 KB Created: 2020-10-28 01:54:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: b82e907d89f6359006a552abd945ddee SHA-1: 974c591f696ef6286b57c5a5614312113b49c7c3 SHA-256: 0eb2886ecb56f855fd3933ffd6ed93d39fb17c9778b744d122944e4e04781793
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded links, one of which points to a known malicious redirector. The document body, though heavily obfuscated, contains text suggesting it is a 'workbook answers' lure, which is a common tactic for phishing or scam campaigns. 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.club/123?keyword=vadets+module+3+workbook+answers In PDF document text
    • https://cdn-cms.f-static.net/uploads/4379369/normal_5f9500bf4f9ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387811/normal_5f92a651d535f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377905/normal_5f92642087fdc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384639/normal_5f95eb9e25a3a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421365/normal_5f966bb7b0b83.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365570/normal_5f9098665d5b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370302/normal_5f8acce254284.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/1/0483/4417/0647/files/fulolatawototow.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/7114/6650/files/67311892383.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0494/1748/6503/files/34463113641.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db9f4d04-8bd3-464b-b0de-a994f26f9c9f/dodge_ram_6_speed_manual_transmission_problems.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4c50d13-fc3c-4afc-b6ca-b863025d1fce/47697389508.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff79e3d6-9bb5-4b45-b209-d9d3587e882f/79982473362.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fae98e6d-332b-40f9-b4dd-ab38d7f83e67/75293683370.pdfIn PDF document text
    • https://s3.amazonaws.com/mutirexa/82220001398.pdfIn PDF document text
    • https://s3.amazonaws.com/wapabefizosumi/womerapuso.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/principles_of_behavioral_genetics.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_off0000e0ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0FF 5396 bytes
SHA-256: 4148f5b9f38ebd7239b7b2966670a76f2bb504e0b9f012a36092cdfc78a12295
font_01_sfnt_off0000f356.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF356 11604 bytes
SHA-256: a7fc00fd61da7fb861df9a0fc3da548ab13dbf7c2384a6fdd8b1b840ce54a166

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