Malicious PDF — malware analysis report

Static analysis result for SHA-256 87ef2f1ef926050f…

MALICIOUS

PDF

39.0 KB Created: 2020-11-05 05:24:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 76986f910c130e82b281e3ca6affaf96 SHA-1: 8563c671635aeb0e3038de5314ec52a44a992864 SHA-256: 87ef2f1ef926050f935f1ac9951c0e840825301896b782e1630f08951a69a2df
124 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 that redirect to known malicious infrastructure, specifically a URL designed to mimic an 'everydollar app login'. The document body, though heavily obfuscated, contains fragments of this URL, indicating a phishing or credential harvesting attempt. The PDF's structure and numerous links to disposable hosting further support its malicious intent as a link farm for malicious redirects.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=everydollar+app+login In PDF document text
    • https://dulowufokupi.weebly.com/uploads/1/3/4/4/134495444/2041db130.pdfIn PDF document text
    • https://wozogerodinanu.weebly.com/uploads/1/3/4/4/134498855/79525d1f2480.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416131/normal_5f9a736debdcf.pdfIn PDF document text
    • https://mukaxonalox.weebly.com/uploads/1/3/4/5/134580963/2510551.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366063/normal_5f89a36eb88ba.pdfIn PDF document text
    • https://ziwarojuwetupo.weebly.com/uploads/1/3/4/3/134343479/zimakoti.pdfIn PDF document text
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/foburadip.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420448/normal_5fa2167456b31.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366033/normal_5f8701ad38e70.pdfIn PDF document text
    • https://mikodetakono.weebly.com/uploads/1/3/4/4/134497144/kilot_jotox_pifamoxa_xojisu.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://uploads.strikinglycdn.com/files/094f882d-9aad-4868-ae81-9b950509fb5e/zewonakuwajavifewek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e521d9f6-1ce7-4a78-927c-4ed088433fe5/41518676350.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e000587c-9519-405a-aa6b-adeac8defb9b/nba_2k17_my_career_glitch.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_off00004d1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4D1F 4776 bytes
SHA-256: 591d4b2dbfd4e02f0a8c9174df57100d10d0d6adbcae60666197350e5f5c4d0f
font_01_sfnt_off00005d69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D69 10656 bytes
SHA-256: 506bc794ebcc3c28a36b8b0b6e834a292d1d5149cf4d7881e30e448c16fc768d
font_02_sfnt_off00008195.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8195 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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