Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c4d136ec2d8ef65…

MALICIOUS

PDF

50.4 KB Created: 2020-10-14 16:50:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 8b307a79a9b0bd644ca4c573c0604e09 SHA-1: 75e058fefc14f9d55eab047ce25ef38afd2a5e28 SHA-256: 1c4d136ec2d8ef6561b6b86951450a714678542e5448a0e787fe5645cc24bd06
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many pointing to disposable hosting domains, which is characteristic of SEO link farms or content distribution networks for malicious sites. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' specifically flags a redirector URL, indicating a potential redirection to malicious content. While no scripts were extracted, the structure and link farm nature strongly suggest an intent to lure users to potentially harmful external resources.

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://ttraff.link/pify?keyword=suorin+edge+manual+pdf In PDF document text
    • https://site-1041865.mozfiles.com/files/1041865/51986197685.pdfIn PDF document text
    • https://site-1042720.mozfiles.com/files/1042720/tesapogewixuvid.pdfIn PDF document text
    • https://site-1037881.mozfiles.com/files/1037881/83292555581.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365552/normal_5f87012143fb7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366034/normal_5f87007b1f1d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366044/normal_5f86f50735357.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365607/normal_5f86f67bca788.pdfIn PDF document text
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/3079835.pdfIn PDF document text
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/lulodegoner.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/36ce75ac.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/d2fa2789-6bdc-4eda-8f1f-d020ffad20b8/sapelenozesazasemipuwij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69838296-a36b-4300-a8e8-b5800ed96faf/23255239649.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/8515/1390/files/xupetulatorojidurosijas.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/9074/2948/files/big_head_soccer_unblocked_at_school.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/7172/9564/files/shotgun_flashlight_mount.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/5740/0994/files/25441413633.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/1285/6229/files/sexual_astrology_book_martin.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_off00008600.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8600 5288 bytes
SHA-256: a3f8de903fda4dd2f46798205eaf84a005bbc4f087ef5fac616525da8aac3190
font_01_sfnt_off000097dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x97DD 10712 bytes
SHA-256: 3036d455893d9c0afbe8bc5170cdf0af1e12c7602a995a20c935b4b7ea6a17a7

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