Malicious PDF — malware analysis report

Static analysis result for SHA-256 d716c5623089a107…

MALICIOUS

PDF

44.8 KB Created: 2020-10-05 00:50:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 399d9632e54b6f0b3950f245b3f80708 SHA-1: 59c85da8ae9d81e63b6ee6953f6afc2f080ea638 SHA-256: d716c5623089a1071b43393be4484ed08e0d36da36902cc597d42d5bed83144e
224 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external PDF files hosted on disposable domains, a technique often used for SEO manipulation or to distribute further malicious content. One critical heuristic identified a malicious redirector link, suggesting a potential phishing or malware distribution attempt. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not 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://ggtraff.ru/strik?keyword=the+care+and+keeping+of+you+tampon+page In PDF document text
    • http://files.miasings.com/uploads/1/3/2/8/132815791/27342d5bb9fe079.pdfIn PDF document text
    • http://files.brendanmark.com/uploads/1/3/0/7/130739119/41415.pdfIn PDF document text
    • http://jadopabe.advocates12508.com/uploads/1/3/0/7/130739430/c0a6d09.pdfIn PDF document text
    • http://nuvegoneb.metropolitanchristianbibleinstitute.com/uploads/1/3/2/8/132815961/d849f7ea.pdfIn PDF document text
    • http://files.caitlinlikens.com/uploads/1/3/1/1/131163782/e8bc76eef.pdfIn PDF document text
    • http://files.goodbless.us/uploads/1/3/0/8/130814594/3084455.pdfIn PDF document text
    • http://files.birthto5partnerships.org/uploads/1/3/0/8/130814297/paden.pdfIn PDF document text
    • http://wixigiris.pickrenoutreach.com/uploads/1/3/2/7/132710677/28c5e5.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/b4f4b3c2-d7ab-4e01-840d-c4b6eb9854a3/6106388380.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a83fbb9e-e430-4845-86bf-d40574875a97/favofanorotimob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a3a3c90-408a-4b70-b059-e75dd3dd4050/55481721441.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f7bbfb7-09d0-42eb-b06b-33afd616d610/famipopofesufakero.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_off00006441.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6441 5356 bytes
SHA-256: 8a5dfc50130c7372a16d9309592a6c3410804a165d9c40c564774fab9c3bc9f9
font_01_sfnt_off0000764f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x764F 9824 bytes
SHA-256: 8f95722b7a57371d02a8204965d7204c63bbbb14fca81a1e41df80e8b386db85
font_02_sfnt_off000097d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x97D3 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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