Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c97b738038447f9…

MALICIOUS

PDF

58.0 KB Created: 2020-10-01 08:00:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: adf1a94504a6d39422c0b988698e66a1 SHA-1: 1b5177674c6f1aa96d032e722390a5e098d57962 SHA-256: 7c97b738038447f9bbcb336426384aae975878b169b1912c69c4e57f306613d6
184 Risk Score

Malware Insights

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

This PDF document is identified as malicious due to its function as a link farm, directing users to numerous external websites, including a known malicious redirector. The document body, though heavily obfuscated, contains a URL that appears to be part of this malicious infrastructure. The presence of many links to disposable hosting and a malicious redirector suggests an attempt to distribute malware or phish for credentials.

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 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.
  • 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://gettraff.ru/strik?keyword=analytical+separation+methods+pdf In PDF document text
    • https://site-1036816.mozfiles.com/files/1036816/ruraj.pdfIn PDF document text
    • https://site-1036680.mozfiles.com/files/1036680/46895566541.pdfIn PDF document text
    • https://site-1036713.mozfiles.com/files/1036713/torebugefudexamolutus.pdfIn PDF document text
    • http://files.intoutuotni.com/uploads/1/3/0/8/130874332/9d1462e03.pdfIn PDF document text
    • http://files.anthonysavidge.com/uploads/1/3/0/7/130776164/junujazapul.pdfIn PDF document text
    • http://files.bcgevents.co/uploads/1/3/1/4/131482887/9912703.pdfIn PDF document text
    • http://files.bhawanimaa.org/uploads/1/3/0/7/130739648/632af4fa.pdfIn PDF document text
    • http://golajiko.discusamerica.com/uploads/1/3/0/9/130969858/nises.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off00009601.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off00009601.bin)
    • http://www.daltonmaag.com/In extracted file (font_02_sfnt_off0000caf7.bin)
    • https://uploads.strikinglycdn.com/files/db9bf220-5116-4e0f-a32a-1b7657743667/10218263208.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0aef452d-1dc8-46ea-b1d8-d5ec817242c1/figerodorofowexizoneferer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/135e3076-2497-4048-90cc-3a1acac6d5d7/gokipiguzepudugodixumem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43ffe4c4-2b66-4a24-af5d-44318031f654/nobopunutebena.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3bce2d1-b18e-4e10-b95c-7b27a2bf0f17/gineduruxafizaxiwepudo.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 extracted file (font_00_sfnt_off00009601.bin)

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009601.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9601 5272 bytes
SHA-256: edd81275b739dd372ec5f4cd479a58be7edf5cabcbe069d47f418c32b0257d8a
font_01_sfnt_off0000a7bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA7BF 10304 bytes
SHA-256: 8db18a2e8b953265c0951849270b7b73c7c8ccef90412b6800c7bdffdb3afb8f
font_02_sfnt_off0000caf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAF7 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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