Malicious PDF — malware analysis report

Static analysis result for SHA-256 910fd5b2677cd195…

MALICIOUS

PDF

38.8 KB Created: 2020-10-29 17:28:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: f03f52748f6130452f8b21aa1371f6c5 SHA-1: c2984ca05bd8cfe5fa6d11520bf1e728fba4f8d7 SHA-256: 910fd5b2677cd1955d73e87be834d8ef52b8a568dbc85e349820c55748ab54a2
144 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded URLs pointing to known malicious redirector infrastructure, specifically `https://cctraff.ru/123?keyword=verizon+wireless+remote+call+forwarding`. The document body, though heavily obfuscated, contains references to Verizon wireless and appears to be a lure to entice users to click the malicious link. The ML classifier strongly flagged this PDF as malicious, and the presence of redirector links indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://cctraff.ru/123?keyword=verizon+wireless+remote+call+forwarding In PDF document text
    • https://siveruvamavekug.weebly.com/uploads/1/3/4/2/134266289/83d5a882471d15e.pdfIn PDF document text
    • https://vimikipemaw.weebly.com/uploads/1/3/4/3/134331773/430791.pdfIn PDF document text
    • https://sexozorojupur.weebly.com/uploads/1/3/4/3/134390270/fufatepuni-kofuf.pdfIn PDF document text
    • https://vevejeda.weebly.com/uploads/1/3/0/7/130776099/wujumoj-womivuzile-subejivanoge-werowubara.pdfIn PDF document text
    • https://tugajepefur.weebly.com/uploads/1/3/1/4/131453805/libitig-vifakana-duwolibabenafe.pdfIn PDF document text
    • https://babikovinemixe.weebly.com/uploads/1/3/1/8/131856339/karulubenawope_rodifanabafu_fosaloripejeno.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f6f3819-596c-47e4-a507-63cf1622c62f/84877752434.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49451c0e-0970-48c2-add6-30eefac8a16b/zevutadure.pdfIn PDF document text
    • https://s3.amazonaws.com/gujutavevive/wemagizajoxatemudabove.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4a54b38-f16b-4fd4-9c90-63cbd0fbdfd8/58068991690.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3c8d06f-5a41-42da-b3ab-68145aca0a45/four_rightly_guided_caliphs_timeline.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/1607/9528/files/chicken_foot_soup_with_coconut_milk.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_off000059df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x59DF 5448 bytes
SHA-256: b774bbb3d7dce40ca47e5890a852b1729a2a2cacccad715fc2b4f184d9c499e6
font_01_sfnt_off00006c6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C6E 9924 bytes
SHA-256: 9526ac07f1cc18d42fed5075aac58941faf7f98452ae209298c9790619f89414

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