Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3907ad891f79ea3…

MALICIOUS

PDF

69.6 KB Created: 2020-10-29 08:30:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 8b6654eb1834406fe1dcbf1c69af13ae SHA-1: 84629291da69241f4c37435936af94e28632433e SHA-256: f3907ad891f79ea3ce1b704dcbf741ac1d0f07befab2bb6f150137693b9f94b3
192 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous links to external PDF files, many hosted on disposable domains, suggesting a link farm or SEO poisoning tactic. One critical heuristic identified a link to known malicious redirector infrastructure. The presence of a 'download button' lure further supports a malicious intent to redirect users to potentially harmful content.

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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=artist+grant+proposal+sample In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366365/normal_5f92d8d029496.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368489/normal_5f915ac47ed8a.pdfIn PDF document text
    • https://gozofuma.weebly.com/uploads/1/3/0/8/130874065/gipegebimorudo.pdfIn PDF document text
    • https://jutivodip.weebly.com/uploads/1/3/4/4/134489611/167212088572d1f.pdfIn PDF document text
    • https://viwawisigox.weebly.com/uploads/1/3/4/3/134342504/7796003.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375095/normal_5f8e8f8ccb669.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366399/normal_5f8d847636ed0.pdfIn PDF document text
    • https://gemaxudemaxepeb.weebly.com/uploads/1/3/1/0/131070646/827747.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369760/normal_5f88b50421712.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368468/normal_5f87795244aac.pdfIn PDF document text
    • https://wedebiki.weebly.com/uploads/1/3/0/9/130969436/zejup-logedi-polenopi-zajomajizadozen.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369150/normal_5f90904cceba5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1bb6ddc-48d4-4ce1-a9a7-8c345c19149b/2739878948.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b10ab1cc-b980-4d1b-90fc-873859893e42/94504892419.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/sanosokavamumod.pdfIn PDF document text
    • https://s3.amazonaws.com/megodipewukitoj/chamakam_lyrics_in_kannada.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/mathematics_education_project_topics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a7b75a2-1564-4a8e-b649-09465cc135d8/types_of_business_model_generation.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_off0000d17f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD17F 5128 bytes
SHA-256: 38b8e31d1e374328b7764821272f149711b850a839115e6e9557cda3411f3ca8
font_01_sfnt_off0000e2dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2DC 11464 bytes
SHA-256: a238fea94bcf4c2043ce36ee25ccfa7dbe61787f032b5acaeded4ca64e94e07f

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