Malicious PDF — malware analysis report

Static analysis result for SHA-256 624fafbc063bf453…

MALICIOUS

PDF

43.8 KB Created: 2020-11-07 20:35:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: b7a7d9127e82e4b5d055b068fd7b3447 SHA-1: 31aac8dc75dc35ce586cd98e600c61a8ef803df7 SHA-256: 624fafbc063bf453de478777ec5d42b854dca1c6c09fddffcdc2df31c6180586
124 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains numerous embedded links, with at least one identified as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains a URL that appears to be part of the malicious infrastructure. This suggests the file's primary purpose is to lure users to malicious sites, likely for phishing or further malware delivery.

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://cctraff.ru/aws?keyword=the+sea+of+tranquility+fallout In PDF document text
    • https://kuxunudizovisaj.weebly.com/uploads/1/3/4/3/134321976/8eb7823.pdfIn PDF document text
    • https://nugekepujipa.weebly.com/uploads/1/3/4/3/134318644/fuxajupo.pdfIn PDF document text
    • https://nugaridepi.weebly.com/uploads/1/3/4/4/134474671/daditozigafoko_fixazenobanol.pdfIn PDF document text
    • https://sexozorojupur.weebly.com/uploads/1/3/4/3/134390270/5688171.pdfIn PDF document text
    • https://gerexogevi.weebly.com/uploads/1/3/4/4/134463414/dizunadazezowogo.pdfIn PDF document text
    • https://fakimodixoto.weebly.com/uploads/1/3/0/7/130739088/4958130.pdfIn PDF document text
    • https://jivexine.weebly.com/uploads/1/3/1/3/131380908/dekek.pdfIn PDF document text
    • https://wexegupewafux.weebly.com/uploads/1/3/4/4/134443826/butugimosonodofoxu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://damabeni.files.wordpress.com/2020/11/gunizepozezebufe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3cc04b01-6ed7-4fff-afd7-e0f820d84d81/69529285244.pdfIn PDF document text
    • https://s3.amazonaws.com/bupijila/93134804216.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97f68062-fc2a-4cea-810f-2b0ec3faf581/75971130332.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf5ce0a7-5a32-4bd4-891c-b78c4e06a2a6/roam_dallas_county_public_records.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ffd58623-8cd4-41d1-af19-17413669b51f/rurele.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_off00006e50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E50 5032 bytes
SHA-256: 64aa92f85c1f3ec7295c14f080314e6399f749251190b8081fc28cbef261d59a
font_01_sfnt_off00007f73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F73 10144 bytes
SHA-256: 03b8634320a183671895cd295bfd2a818a0caa0ede71e3fbb03c52303e706d18

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