Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bb4926bbb87c2d3…

MALICIOUS

PDF

63.4 KB Created: 2020-10-04 21:33:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: bdb0e9180dae1ab6f82e2008514e0abe SHA-1: 77d6070dbc3e5b72d99320449d9c281280a08377 SHA-256: 0bb4926bbb87c2d3c7ab77877723f12e3820bed9f23c19679a43124c31f2b0b3
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on disposable domains and appear to be part of a link farm. One critical heuristic identified a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that matches the one identified by the redirector heuristic, suggesting an attempt to direct 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://gettraff.ru/strik?keyword=acer+aspire+one+d270-26dkk+specs In PDF document text
    • http://files.salonindigopa.com/uploads/1/3/1/6/131637679/wedepide.pdfIn PDF document text
    • http://files.creeksidecares.org/uploads/1/3/0/9/130969131/datovemanukuv-mimopafu.pdfIn PDF document text
    • http://files.millbrookrotarydirectory.com/uploads/1/3/0/7/130775846/d99ea.pdfIn PDF document text
    • http://lemaxu.johngaylord.com/uploads/1/3/1/8/131856979/2336601.pdfIn PDF document text
    • http://files.modumartialarts.com/uploads/1/3/1/3/131384552/xajufuw.pdfIn PDF document text
    • http://gunemikil.karinwaskiewicz.com/uploads/1/3/0/8/130813059/1054030.pdfIn PDF document text
    • http://files.gabriellemyers.com/uploads/1/3/1/4/131437878/raxeposolowunas_tiwuj_wizukipevibexe_tanofopepimu.pdfIn PDF document text
    • http://files.operawithpearls.com/uploads/1/3/0/7/130775958/8477990.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0492/3041/3980/files/infinite_scholars_program.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7102/0957/files/68113962823.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56f9b5d9-bb5d-4907-a529-dbd6c238242a/78817794329.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08abe5ac-f5c7-42e7-92e0-61278fa2f9b3/lokiderakirej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8e66a33-6a3f-4886-a5b0-559046aa98e4/37905477423.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ba3672e-2174-447f-8b45-740238c03cdd/pebepuxununuvili.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fe543ee-2745-4f87-856a-3b443310990d/59581139286.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_off0000b38c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB38C 5628 bytes
SHA-256: 75e9d3989fc044cb9b51887cf1542c68bfc28aea8fe5f017a5116636ebaf771f
font_01_sfnt_off0000c6d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6D5 12692 bytes
SHA-256: 8ed777a46aeae3d213e4c4026e4db6837a093255cb193d777b32185f7a7bdc1e

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