Malicious PDF — malware analysis report

Static analysis result for SHA-256 7061baebfe326db8…

MALICIOUS

PDF

31.8 KB Created: 2020-11-04 14:33:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: f8b3928f6bbac82ea4262637ec8f9aa2 SHA-1: 9e815d2ec90acaf63dc9d36592f16830fb028401 SHA-256: 7061baebfe326db80ae58828b058fc53665087e148fa7f28763bc5555dc31e57
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious due to its structure and embedded links. It functions as a link farm, containing numerous external links, many of which point to potentially malicious redirectors or SEO-optimized content farms. The primary malicious URL identified is https://cctraff.ru/aws?keyword=learnsmart+chemistry+answers, which is flagged as a known malicious redirector. The document's intent appears to be to drive traffic to these external sites, likely for SEO poisoning or to distribute further malicious content.

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 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.
  • 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/aws?keyword=learnsmart+chemistry+answers In PDF document text
    • https://cdn-cms.f-static.net/uploads/4389821/normal_5f90950574e0c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369327/normal_5f9a45ad7c42a.pdfIn PDF document text
    • https://zonerizarom.weebly.com/uploads/1/3/4/3/134310007/3222330.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/logape.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412588/normal_5f9d71d0b576c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403808/normal_5f9707327aec3.pdfIn PDF document text
    • https://pesadosopovito.weebly.com/uploads/1/3/4/2/134235692/tukul_rukuf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463010/normal_5fa1e677ac845.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380080/normal_5f8fd9baca665.pdfIn PDF document text
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/vunidixeviro_xitosujitupile_kadape.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/d225d194-6801-41f6-a64b-7e1a0b742279/87283639199.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30cb254c-6908-4e8f-a04e-7296a9f0be09/tivawegofasijur.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_off00004096.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4096 5144 bytes
SHA-256: 9da46c00faf01e63bc222f58b6cb1d9734773a99443b5d2020f9f63393efedea
font_01_sfnt_off00005201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5201 9508 bytes
SHA-256: d82f96265ebdcdbfdc75b7da530c07ffd8675f14e3f80bc8d2460f3a892370c5

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