Malicious PDF — malware analysis report

Static analysis result for SHA-256 a282783e468a8814…

MALICIOUS

PDF

52.0 KB Created: 2020-10-28 12:37:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 501a77761bfe8ce76979635c6384df77 SHA-1: bd35a59eaa42e8e3f9e40ae995af0e4c7ed84d27 SHA-256: a282783e468a88147c68f0a1a38ca29c39beec49dc0a3e8243bda1f11692eb3f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links that redirect to a known malicious URL, indicating a likely phishing or scam attempt. The heuristic 'PDF_SEO_LINK_FARM' suggests the document is part of a larger network of linked PDFs designed to obscure the malicious destination. No scripts were extracted, but the presence of malicious redirectors and the ML classifier output strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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://ggtraff.ru/strik?keyword=plan+diario+departamento+de+educacion In PDF document text
    • https://cdn-cms.f-static.net/uploads/4368956/normal_5f8f4d1359aa8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367286/normal_5f88a62b33060.pdfIn PDF document text
    • https://vixijusodu.weebly.com/uploads/1/3/0/7/130776714/lemixesuwupo_rumavixesefo_potamapu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365589/normal_5f99138b3abf8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409606/normal_5f975fd425a5c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369138/normal_5f8a62f4edffe.pdfIn PDF document text
    • https://kuvofexe.weebly.com/uploads/1/3/1/1/131163751/zisedobaronux.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366340/normal_5f932b552d770.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417659/normal_5f95948d3e645.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368248/normal_5f8986f76f8bc.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/1/0494/0277/3671/files/90159325401.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b79e8af-1e39-49c8-9c9a-79412386ac6b/78461412807.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96206d3e-8f3d-4b69-a9ab-cb4c44fa4360/venifukotuf.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/9929/4363/files/wuvakikav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8badd668-6221-4dd6-b2da-5cfa7d190205/nikoporaluxenovewozul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ad52e8f-e06a-4f58-9ee2-e16edf0eae0d/80393786641.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/4157/3022/files/funnest_game_unblocked.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6c26cc5-f357-4c2f-a584-576499ad0640/77430884738.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0319/9138/files/direct_speech_reported_speech_exercises.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae7de887-d6d7-4a83-bab5-bd0636facae9/wejobuj.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0000a3bf.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xA3BF 18180 bytes
SHA-256: 45669d651a9dcf37f1cd9aca031b56e30e3e8b0def1dddd1f1837f29eb0f7b5b
font_00_sfnt_off0000645d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x645D 5040 bytes
SHA-256: f9ea81254f9ac6a823191c9ca5480f2054e2fed328fe8822c0e8f10d310c464e
font_01_sfnt_off00007565.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7565 2116 bytes
SHA-256: 8db65adc699bed2ed4e99b174e414cace916d9ae25f4e5597e3d94de4d1667c8
font_02_sfnt_off00007f0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F0D 11112 bytes
SHA-256: a0cf1b76a648f701cdba7b50791e764c330ae3b5b793c666a312cfc15e0065e2

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