Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bd191b398946610…

MALICIOUS

PDF

41.5 KB Created: 2020-10-04 03:18:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 7ea8654e94112012d4838779d6091b6b SHA-1: 599ed5fca40be1fa2b39c2747f6ec6e571cf4fb2 SHA-256: 3bd191b39894661075e4515a9ebdbbe6d028a82ca864d85d291955f38fd75e93
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 and redirectors, indicating a link farm or SEO spam campaign. One critical heuristic identified a link to known malicious redirector infrastructure. While no scripts were extracted, the embedded URLs and the PDF structure suggest an attempt to lure users to malicious sites, potentially for phishing or malware distribution.

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=the+power+of+birthdays+stars+numbers In PDF document text
    • http://jetazujak.lundquistlabs.com/uploads/1/3/1/4/131437299/291976.pdfIn PDF document text
    • http://towuvux.onlykingsnavigatemusic.com/uploads/1/3/0/7/130775735/gomanu.pdfIn PDF document text
    • http://files.powerandlightdesigns.com/uploads/1/3/2/6/132683078/fiwabamafame.pdfIn PDF document text
    • http://files.corbyphotoclub.co.uk/uploads/1/3/1/4/131437599/mugosanulebozi_najufeba_vuwozama_fikofakinine.pdfIn PDF document text
    • http://files.elatell.com/uploads/1/3/0/9/130969097/84f77.pdfIn PDF document text
    • http://fejomiro.domesticfabrics.com/uploads/1/3/0/7/130739723/7570517f.pdfIn PDF document text
    • http://files.mountainclay.com/uploads/1/3/0/9/130969823/moninosujamanuwok.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/ae78ad24-c668-4701-980e-5ca3fbe52afe/94632564733.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf7ac0e6-a9b1-4415-ac4b-88da085d3c39/libiladobijuruvulo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/507d6f28-010d-495d-8d0f-812be3a7660c/gawuvolujagaromusozurun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ace2f7d5-881e-47b6-9967-88fd12e4e246/90102053008.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_off000062ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62AB 5532 bytes
SHA-256: b450816e195fc67cc8b921530e3067a8c20212e8284d7a641be7595dbbf1d847
font_01_sfnt_off0000755c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x755C 10548 bytes
SHA-256: 9a24330e1c3f41043361b6c55aacac51a943ec9d9e3804064f0eefdc3e3e3799

Open this report in the interactive analyzer, or submit your own file for analysis.