Malicious PDF — malware analysis report

Static analysis result for SHA-256 796921393435659f…

MALICIOUS

PDF

45.2 KB Created: 2020-11-03 16:50:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: b7a198b55d1507157eca029f1284f24c SHA-1: db8c4867418a2411369934fb208f9fca57e0c46c SHA-256: 796921393435659f8a47feca5bd590dba751d33fb4e095f382647f79dd106e3a
124 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded links, with a critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector. The PDF is structured as a link farm hosted on disposable domains, indicating a phishing or redirection attempt.

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 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=lion+skeleton+bones+is+valuable In PDF document text
    • https://jujodupif.weebly.com/uploads/1/3/2/3/132303189/8083424.pdfIn PDF document text
    • https://jerewetazawupej.weebly.com/uploads/1/3/4/3/134384555/gabuvupogifomegov.pdfIn PDF document text
    • https://xoforovujedopod.weebly.com/uploads/1/3/4/5/134587448/3439597.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401538/normal_5f930721ab2c4.pdfIn PDF document text
    • https://rawavofim.weebly.com/uploads/1/3/1/4/131452817/ramotopu.pdfIn PDF document text
    • https://papunagaku.weebly.com/uploads/1/3/1/3/131384156/vizerime_kinidul_sikiruga.pdfIn PDF document text
    • https://dawugagulinejud.weebly.com/uploads/1/3/4/3/134368664/kuvepitamajewu-safufoxo-pipazixi-wewaju.pdfIn PDF document text
    • https://bofufawikifof.weebly.com/uploads/1/3/4/2/134235483/dizizo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/712f7847-fd36-4ace-8274-b056128906c2/26337553428.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a96fc4d-c095-4c08-8245-959a95c3e36e/loruvevigasutomadasadonu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b40e1cd4-031a-4685-bc5a-e0edb3f6aaa6/nuwawerakatapowitulimevo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5dfdf875-971d-4d37-9222-5cd39f6ce481/ar_223_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98e7af21-cdd8-4914-bf8f-a549c0253883/steak_n_shake_nutrition_guide.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000652c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x652C 4668 bytes
SHA-256: d669c20cf9922bea97f908631aa1ed83f6cb0808b3412312f363fc3403db558b
font_01_sfnt_off00007524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7524 10324 bytes
SHA-256: a751e17e34714ee6aedea86929399cf9e31fca50d4321ccb8fbf01fe80966166
font_02_sfnt_off00009886.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9886 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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