Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff517f2b48cabc3e…

MALICIOUS

PDF

32.4 KB Created: 2020-11-06 22:17:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: a523c171b22ba99b4e359dda3b3b4d4e SHA-1: 3b07c03212dcd754d2f8f704270040a69680f379 SHA-256: ff517f2b48cabc3e80d483a3e7f880aac411ad501667dec8f09132282ac0bcdc
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document was identified as malicious by an ML classifier and contains a large number of external links, many pointing to disposable hosting. The document body contains a URL that appears to be a lure for 'Kawairun 2 unblocked', suggesting a potential gaming-related phishing or malware distribution scheme. The presence of embedded URLs and the link farm structure indicate an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafficel.ru/aws?keyword=kawairun+2+unblocked PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4421214/normal_5fa2123c8bfe2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383791/normal_5f961291b19be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445116/normal_5fa18554ee329.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390642/normal_5f984bbf4e4a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370288/normal_5f881dd8a0204.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422884/normal_5f98185147b04.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://nevosaxovib.files.wordpress.com/2020/11/fizimobaruweboratiweti.pdfIn PDF document text
    • https://xebetok.files.wordpress.com/2020/11/x_tenso_hair_straightening_instructions.pdfIn PDF document text
    • https://dufakeribeze.files.wordpress.com/2020/11/rezonamumewaveludefidax.pdfIn PDF document text
    • https://sisiviweze.files.wordpress.com/2020/11/50939477702.pdfIn PDF document text
    • https://xanafegeze.files.wordpress.com/2020/11/munuzaragujilupipazabik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56d8cf8e-8ca7-4982-8e9d-718536b01ed6/66849957125.pdfIn PDF document text
    • https://gukoxawe.files.wordpress.com/2020/11/20884693481.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_off0000425c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x425C 5152 bytes
SHA-256: 89fa6c578af9491a2739ca4fe9251850cffc691ab5a0f0d7118c47107ad03efa
font_01_sfnt_off00005407.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5407 9776 bytes
SHA-256: a07103440dd2b0358d34f78d4f9be765ca46e046a992485cedc43d79e388be50

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