Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e1d1614ca120905…

MALICIOUS

PDF

57.2 KB Created: 2020-10-26 13:31:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-28
MD5: 940bd504245acf3b3e398513cdd8bca3 SHA-1: a5e27649e74a986823ab47129c980b3395253490 SHA-256: 6e1d1614ca120905d1894c796981745c747a83950bd65c15ca79983d40f49b7e
184 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, many pointing to disposable hosting services, indicating a link farm designed to manipulate search engine results or redirect users to malicious content. One critical heuristic identified a link to known malicious redirector infrastructure. The document body itself contains obfuscated text and URLs, including a direct link to a malicious redirector and multiple links to Weebly-hosted PDFs, suggesting an attempt to distribute further malicious content or engage in SEO spam.

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=katawa+shoujo+lilly+good+ending In PDF document text
    • https://xazapadikud.weebly.com/uploads/1/3/1/8/131871762/1844859.pdfIn PDF document text
    • https://tarirubawapub.weebly.com/uploads/1/3/1/6/131606173/7082916.pdfIn PDF document text
    • https://desaviguwogo.weebly.com/uploads/1/3/1/8/131871994/wexogipiniwa.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/nimemoroligamaj-tafixidupara.pdfIn PDF document text
    • https://xosotujusosevo.weebly.com/uploads/1/3/4/3/134377620/fevirerasoxiz-wonelik.pdfIn PDF document text
    • https://sepubipig.weebly.com/uploads/1/3/4/4/134445985/sajusiverasix_tudawatomigom_runogelodedita_vemubesukofuju.pdfIn PDF document text
    • https://terowibew.weebly.com/uploads/1/3/4/3/134370771/biraguso-zibovekadiv.pdfIn PDF document text
    • https://sonilotosoj.weebly.com/uploads/1/3/1/3/131379329/9027042.pdfIn PDF document text
    • https://tabuxeniki.weebly.com/uploads/1/3/2/6/132682737/wozoxawe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408709/normal_5f93b89254d75.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376357/normal_5f89c1935352c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408481/normal_5f95877b43313.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://cdn.shopify.com/s/files/1/0434/4548/5725/files/difference_android_and_cyborg.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/7396/8539/files/gaana_premium_apk_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17f8517c-03fa-4c15-9771-1478f528c97e/rerapuvosedelafebo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7a1047d-7a1d-4e3a-8b8f-64f3d996148f/11783515159.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c28bf5f-df65-40ab-a233-1ecc3dea3a7f/85272097206.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b222f8a9-c325-4320-a526-a734bfb0db0d/82986224686.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000072e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x72E5 5112 bytes
SHA-256: c410e507ce57886d265dff65f29de434047c3bb05c743e2e2b424412ced022c7
font_01_sfnt_off0000845a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x845A 1800 bytes
SHA-256: a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
font_02_sfnt_off00008ce7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CE7 11120 bytes
SHA-256: 7e59a1a5baeefb4ae95b905eb4175bb213022d20fa7c823bf9d3412564f9231f
font_03_sfnt_off0000b2e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2E9 16312 bytes
SHA-256: 028dbaa76d48ae99b02248bacea50134e27ed131f5dd39e25ac401de8961e19b
font_04_sfnt_off0000c875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC875 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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