Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac6593aba59747a4…

MALICIOUS

PDF

37.4 KB Created: 2020-10-08 09:27:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 75c38a42c5b18c63bca91529f9a30ef5 SHA-1: abf3993333643965e71d3e50dac0b02a462f5856 SHA-256: ac6593aba59747a42769d1222ddf329a036fe2f7542bfabc2ec22a4e1ca569af
184 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to disposable domains and appear to be part of a link farm designed to attract traffic. One critical heuristic identified a link to known malicious redirector infrastructure, suggesting a phishing or malware distribution attempt. The document body contains a URL that mirrors the malicious redirector, further supporting this conclusion.

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://cctraff.ru/strik?keyword=download+point+blank+mod+apk+offline In PDF document text
    • http://files.samanthaturret.com/uploads/1/3/1/3/131398069/kuwafa.pdfIn PDF document text
    • http://files.annahorsnell.ca/uploads/1/3/1/8/131871825/nokidagajekumazuzema.pdfIn PDF document text
    • http://tevevel.fiddlecasebooks.com/uploads/1/3/0/7/130775050/lumifa.pdfIn PDF document text
    • http://wemifi.rosinakhan.com/uploads/1/3/1/0/131070197/mivisuzumurule_wakalolapeje_bonadoxe.pdfIn PDF document text
    • https://site-1043096.mozfiles.com/files/1043096/jinimasafir.pdfIn PDF document text
    • https://site-1037086.mozfiles.com/files/1037086/dujelubojo.pdfIn PDF document text
    • https://site-1038715.mozfiles.com/files/1038715/detenilinumelu.pdfIn PDF document text
    • https://site-1041611.mozfiles.com/files/1041611/pezidisifamuli.pdfIn PDF document text
    • https://site-1039173.mozfiles.com/files/1039173/lerukimimejaj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/3117/8659/files/what_is_the_ravenclaw_common_room_password.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/592ca193-539c-4a39-8341-af6d49580676/xegopumufodejiratijuxawiw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bccce5cf-0a3b-4778-82b4-8913a6d405e1/16684957391.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75324e34-2a16-4769-9288-4a6cbb552db4/zawasokobisuwogiluduvatu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f419b02-b548-4c0b-9d44-2d3c3cf5ec50/rovudi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57ebb11d-d15b-4287-8db9-7a26b8712d5c/mijedalugizopanal.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_off00005218.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5218 5208 bytes
SHA-256: 382a177714ccff32ed1dc33e53bfe965868b7b7903526b4f7df2fa2292a47240
font_01_sfnt_off000063d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63D8 11240 bytes
SHA-256: 4dedbb143f19eb2e913b02812deed6cc2b2ce3855b6b062e7eb8260a68ba0360

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