Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab7e57a736a8a177…

MALICIOUS

PDF

44.6 KB Created: 2020-10-25 22:45:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 176728a189b32ef55a2a5dfa53da7543 SHA-1: 320da610ed83f3670f52c438d9c2e29467a99d8a SHA-256: ab7e57a736a8a1776c6cb2be5dee892566cf6acbbf8bdb0c2bb37b9b68b29204
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, disguised with a keyword relevant to the document's apparent topic. It also hosts a large number of other PDF links, suggesting a link farm or SEO poisoning attempt. The ML classifier strongly indicated maliciousness, and the embedded URLs are the primary indicators of compromise.

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/123?keyword=expository+sermon+series+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4374181/normal_5f8b7d50063cd.pdfIn PDF document text
    • https://mogilifus.weebly.com/uploads/1/3/0/7/130739831/199877.pdfIn PDF document text
    • https://bupiwuzisulim.weebly.com/uploads/1/3/0/8/130874125/jenekuxikurevaligixo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/solonebosop/advanced_inorganic_chemistry_book.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwawibu/boost_confidence.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/penakavovuxikovokananavag.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/autodesk_sketchbook_android_tutorial.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/77629996853.pdfIn PDF document text
    • https://s3.amazonaws.com/suxiweke/mijail_bakunin_gratis.pdfIn PDF document text
    • https://s3.amazonaws.com/waxapoz/budgetary_control_process.pdfIn PDF document text
    • https://s3.amazonaws.com/wenobagupexekap/concrete_mixing_ratio_table.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/55470310946.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/tubizipama.pdfIn PDF document text
    • https://s3.amazonaws.com/fovezewi/wanirubesopojikeligudirex.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/1750/2361/files/production_of_electricity_from_plants.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6262/4417/files/sonic_dash_sega_apk_download.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_off00007129.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7129 5072 bytes
SHA-256: 72b59fc3766c704d6a60a6c11e45d28d4b58f46ca1ac683898d96886beb61f63
font_01_sfnt_off00008263.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8263 10360 bytes
SHA-256: 685cfbc504e0f3300bd918b4c2507f9a85ff8059cb59228e7409fa1c529ab468

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