Malicious PDF — malware analysis report

Static analysis result for SHA-256 a44034f4e5732291…

MALICIOUS

PDF

36.4 KB Created: 2020-11-03 22:15:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 8b5a64352f2e5cf8a49690d25fcd71ac SHA-1: 91c7186b73f7de84d93c6eca478743af357773e8 SHA-256: a44034f4e57322912cfebd251136c5623006ecdf2263d6e106d27a6e1b900dc6
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 hosting or known redirectors, indicating a link farm designed for SEO manipulation or phishing. The primary link identified directs users to a malicious redirector with a keyword suggesting a lure for 'unblocked games'. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest an attempt to redirect users to malicious content.

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.me/123?keyword=unblocked+games+strike+force+heroes+1 In PDF document text
    • https://xomowapiwaliv.weebly.com/uploads/1/3/4/0/134000086/polelibenonaz.pdfIn PDF document text
    • https://vosaxoro.weebly.com/uploads/1/3/4/4/134469305/fc65c0b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370530/normal_5f893ba933c66.pdfIn PDF document text
    • https://xumogimunosu.weebly.com/uploads/1/3/1/6/131607683/5157619.pdfIn PDF document text
    • https://tubenuluni.weebly.com/uploads/1/3/1/4/131437864/7a471cc190.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/c50a1526-5ff8-460d-941a-7aeb57461f12/52567402517.pdfIn PDF document text
    • https://s3.amazonaws.com/vikukinumet/rugotipogefuzawefu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/6354/9338/files/43927138219.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad16e37d-c29f-4e72-b727-386c515bbc78/xasimo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/5129/2584/files/identity_v_female_dancer_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwawibu/assembly_language_8086_tutorial.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c9072b9-5af4-4541-a5db-cd80fb3be3a4/dafenetutenobubelesapuda.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b45d8d05-29c1-42c1-8c85-387fa44577de/77761582902.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7e39583-331f-459d-9960-299cd03c61a4/xifateziz.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_off00004de5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4DE5 5680 bytes
SHA-256: 6700a39878236776ff402bf8faf32879e52e98026e1ed99a128b8fa0dcbfeeb8
font_01_sfnt_off00006115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6115 10420 bytes
SHA-256: 869f9e4ed9f4ab7074befbd884870e63fca1f28078f41bbd34298616a150c1a8