Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c3227b43e15b87a…

MALICIOUS

PDF

36.7 KB Created: 2020-10-10 15:20:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: cca4fd10746b12a325ea60f86f84ba7e SHA-1: e8fc416db4dadcfe7a6494ac6d60ab7ff4e07b0a SHA-256: 7c3227b43e15b87a97d1fe4529ed26f58148d2eb2c62f27e58313d84a1e7092a
184 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, many of which point to disposable hosting and redirectors, indicating a link farm or SEO poisoning tactic. One critical heuristic identified a link to known malicious redirector infrastructure. The document body, though partially obfuscated, contains a URL that appears to be a lure for downloading a technical book, which is likely a pretext to encourage clicks on the malicious links.

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://ttraff.link/pify?keyword=write+great+code+volume+1+understanding+the+machine+pdf+download In PDF document text
    • http://lijusa.annapike.co.uk/uploads/1/3/1/4/131452838/sojub.pdfIn PDF document text
    • http://files.amateurantics.net/uploads/1/3/1/4/131483281/kebugogak.pdfIn PDF document text
    • http://files.firstathens.org/uploads/1/3/2/7/132710687/9347935.pdfIn PDF document text
    • http://balomus.profilesbylynn.com/uploads/1/3/1/4/131407377/bedazepepuki.pdfIn PDF document text
    • http://files.eloisekerr.co.uk/uploads/1/3/2/7/132711936/riwedofu.pdfIn PDF document text
    • http://vifoxeg.ltbhmfs.org/uploads/1/3/1/3/131380755/bowosilo.pdfIn PDF document text
    • https://site-1042666.mozfiles.com/files/1042666/7036808414.pdfIn PDF document text
    • https://site-1039895.mozfiles.com/files/1039895/katoxuwigogijotolufaboxa.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/098582bd-4e77-4e96-b7ed-042eb10d09e2/41997988214.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f84b1a70-5e48-48e6-8f55-ac4f92908a24/74078104808.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44c6b02c-2bfc-49d3-b76a-a4c8fc4b8dac/52373812529.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f9c415e-f4fe-415c-857d-41faaefa2b5b/60695066119.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3c67c4c-16cc-4019-b150-3d3f8f366957/kexufemo.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_off00004fac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4FAC 5788 bytes
SHA-256: c93334cb356ad07eb8e8179de8fd595bbbc9b4b7651e075e83439a061c30ad80
font_01_sfnt_off00006354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6354 10040 bytes
SHA-256: 2f23144ed1ed52888bb60e4cc6cef9abe779ab58afebd7768c43306546ca0202

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