Malicious PDF — malware analysis report

Static analysis result for SHA-256 8847d13049494de5…

MALICIOUS

PDF

44.6 KB Created: 2020-10-14 00:16:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: e57155b157d2637ee8606c07a4c7952d SHA-1: f59dacb3df71d08e9c6acce04a9b29cb68fbfcbf SHA-256: 8847d13049494de5cbab271d19241b3fa03e2f503711ce3f495e7c5e72c5adc4
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 pointing to disposable hosting services, which is characteristic of SEO poisoning or phishing link farms. One critical heuristic identified a link to known malicious redirector infrastructure, specifically 'https://cctraff.ru/strik?keyword=bully+lite+apk+data+obb'. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the document body itself contains URLs that are part of this link farm.

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=bully+lite+apk+data+obb In PDF document text
    • https://fijojonibiw.weebly.com/uploads/1/3/2/6/132681787/kizerapu.pdfIn PDF document text
    • https://keniwuki.weebly.com/uploads/1/3/1/4/131483234/7904132.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/665612.pdfIn PDF document text
    • https://genigudepa.weebly.com/uploads/1/3/1/0/131070712/gapovowumepekegosiza.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/xududev-ledavodu-jatulivarolaxe-bixebenal.pdfIn PDF document text
    • https://dimaxafazeza.weebly.com/uploads/1/3/1/4/131453031/safado-fodidunixoso.pdfIn PDF document text
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/kezupukono.pdfIn PDF document text
    • https://mogilifus.weebly.com/uploads/1/3/0/7/130739831/8742796.pdfIn PDF document text
    • https://site-1037176.mozfiles.com/files/1037176/27191143433.pdfIn PDF document text
    • https://site-1041782.mozfiles.com/files/1041782/reneruwasisona.pdfIn PDF document text
    • https://site-1036934.mozfiles.com/files/1036934/23283994342.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/63e6c3e2-5269-4b85-a277-2a5280682619/3712454314.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b50f3071-54e3-48f4-b8ce-1288731b9a78/jeweseburoxafotanixet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8921857-2be3-4ded-9698-5ef0d78e6b18/rorozedopimoliduni.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6403 4808 bytes
SHA-256: 8833bdd01f50e58cf39bad4b94544137e7eb2e7d9558596fc24c4a6f2b422e79
font_01_sfnt_off00007469.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7469 10276 bytes
SHA-256: f594dfc96c8ba0ccada0bb0879ec8345cffdb8e258589a6887bae6c98dffb06e
font_02_sfnt_off0000978b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x978B 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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