Malicious PDF — malware analysis report

Static analysis result for SHA-256 f94be2dea9651f95…

MALICIOUS

PDF

40.6 KB Created: 2020-10-11 05:15:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 7a2606bd1f052b6a1fee810d74fbb19e SHA-1: e4435d8b870bfb671ed3a41836045e8e1cd7f610 SHA-256: f94be2dea9651f957f18d1d8bbd9b12bd5f959937284143a7f0931d6d823a8dd
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document contains a large number of embedded links, many of which point to 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 also contains the URL https://cctraff.ru/strik?keyword=minecraft+best+jvm+arguments, suggesting a lure related to gaming or technical topics to entice clicks. No scripts were extracted from this sample.

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=minecraft+best+jvm+arguments In PDF document text
    • http://files.childrenscauseoc.org/uploads/1/3/1/4/131408970/bd4224e9.pdfIn PDF document text
    • http://files.mca.school/uploads/1/3/0/8/130874347/8993391.pdfIn PDF document text
    • http://files.littleeedenfarm.com/uploads/1/3/2/6/132681144/mizifix_wagogimetoge.pdfIn PDF document text
    • http://fodokuraz.liveforthehills.com/uploads/1/3/1/4/131453858/gatejazof_donekapugime_wetukoj_zenoxobuw.pdfIn PDF document text
    • http://vibojad.finefoliage.com.au/uploads/1/3/0/7/130739615/xogiteziwisugi.pdfIn PDF document text
    • http://kedikogaf.999fmradiomanila.com/uploads/1/3/0/7/130738918/jupimuguzute-kemalur-rolob-dabavutep.pdfIn PDF document text
    • http://files.creativeedgedancestudio.com/uploads/1/3/1/0/131070597/lamebupurasu-gukijosinije-kesojekiteroje-mamegiz.pdfIn PDF document text
    • http://files.glendalekfss.com/uploads/1/3/0/7/130739742/bonat.pdfIn PDF document text
    • http://jurep.schneiderfamilymemorial.com/uploads/1/3/2/8/132814938/8ac839f13b30ec.pdfIn PDF document text
    • http://files.zudane.com/uploads/1/3/1/4/131455283/3693178.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/1/0430/4017/8333/files/how_to_pass_riddle_school_5.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_off00006113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6113 5452 bytes
SHA-256: 74787bddb8f182d3947473052e8f5e44d7472104bbc7873ab9c74fcbc1018fe0
font_01_sfnt_off00007399.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7399 10140 bytes
SHA-256: bc9643636d2eb23a7c8686538b41a3e2e1c25e7512c9e3ae419c7c33f253a1de

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