Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f3af19bc1c270f5…

MALICIOUS

PDF

43.7 KB Created: 2020-10-11 22:03:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: d92968c5f6d176810cb5fc49b758e74e SHA-1: f37538ea59f83059f050c5cc8d7123ef0939c405 SHA-256: 5f3af19bc1c270f5f203ea12c05f84ca79605985a3f6323339e198633fb733f3
192 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document contains numerous links, many of which point to disposable hosting and redirect to malicious infrastructure, such as the URL 'https://cctraff.ru/strik?keyword=tekken+blood+vengeance+download+mp4'. The ML classifier strongly indicated maliciousness, and the presence of a download button lure further supports a phishing or scam attempt. The document's primary function appears to be acting as a link farm to distribute malware or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=tekken+blood+vengeance+download+mp4 In PDF document text
    • http://belarewe.furnacehillscoffee.com/uploads/1/3/0/7/130775692/bimudusevolud.pdfIn PDF document text
    • http://files.nalsoflansing.org/uploads/1/3/0/8/130813095/421823.pdfIn PDF document text
    • http://lamizo.insurancehousewales.co.uk/uploads/1/3/1/8/131857419/dilugifolude.pdfIn PDF document text
    • http://sewizajob.ahavattorahla.org/uploads/1/3/1/4/131407089/pifovozib.pdfIn PDF document text
    • http://files.purogato.org/uploads/1/3/0/8/130813606/roxawoxavotug.pdfIn PDF document text
    • http://files.jacobtrimble.com/uploads/1/3/1/1/131163695/kirakole-ragepivef-porabe-febitorimoluwab.pdfIn PDF document text
    • http://zunape.goldfieldsjeweler.com/uploads/1/3/0/7/130740510/006e8685.pdfIn PDF document text
    • http://siramani.aaichstudio.com/uploads/1/3/2/8/132815105/safosokepinutupo.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/363dc032-d20b-42a5-ad1e-1c90e6ba8307/wuvimunekofujodadi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20efea4b-d98f-4ac5-97eb-30066d2ad462/653915625.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c721d8e-40d0-4670-bce6-ecc175e6e3de/pobib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/215e75f5-504c-4248-be7a-81dc404c125b/pekete.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09ad5ae5-6fcb-4877-b751-7abf3cbc76ab/66634972017.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43a1a4b2-9f08-46e4-90f9-80785b87fcc4/xitukinonidur.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_off000069c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x69C6 5512 bytes
SHA-256: e329bcd613aecec9cf7878d395b498126b60f5db595285b81a6bc156a64e9752
font_01_sfnt_off00007c90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C90 11180 bytes
SHA-256: 8cc47c244fc7682dd26bc341492ce7b589ecd66eb378931658958a0e727e543d