Malicious PDF — malware analysis report

Static analysis result for SHA-256 aac94bf393d12463…

MALICIOUS

PDF

75.8 KB Created: 2020-12-28 08:40:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 2837130f0d54828a6445aadedcf32b38 SHA-1: 2d339adcecb9cf5ff16aa3e6a1c606b8fdd1c844 SHA-256: aac94bf393d12463f5b6eed58e1893b57ed4889d25068cc5f08960dad3bf7600
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded URLs, with critical heuristics indicating it links to known malicious redirector infrastructure and a link farm. This suggests the primary purpose is to direct users to potentially malicious websites, likely for phishing or distributing further malware. No scripts were extracted, but the extensive URL usage is a strong indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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?utm_term=cherish+song+free In PDF document text
    • https://cdn-cms.f-static.net/uploads/4375891/normal_5f99e96792975.pdfIn PDF document text
    • https://cdn.sqhk.co/sisalubitot/MFjdhjc/minecraft_skyblock_hypixel_best_sword.pdfIn PDF document text
    • https://solujokorox.weebly.com/uploads/1/3/4/1/134108712/a2dfc82de6bd80a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369920/normal_5f8f9cd2cfeac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501206/normal_5fbdc3c9606a3.pdfIn PDF document text
    • https://cdn.sqhk.co/dekaroku/cibAiiX/scary_teacher_3d_chapter_2_download.pdfIn PDF document text
    • https://kugatovobubusub.weebly.com/uploads/1/3/4/6/134680339/kogilozi_kezenotomex_kegatenilup_xomuguzufeduw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426416/normal_5fe789331e338.pdfIn PDF document text
    • https://cdn.sqhk.co/dusimefosix/iEOgcig/22962992962.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370266/normal_5fc2f30d1b8a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423696/normal_5fafa03dd1a41.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450434/normal_5fe55580cf829.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/f58511bc-f690-41fd-9160-9a349124152f/kajefanimewofi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a80dd44b-f634-4914-88ba-0b55604125c4/xpress_redi_set_go_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa6294a3-d811-4708-9a37-c9f193a8ee87/sejitadopijafajirog.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_off0000ed89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED89 4692 bytes
SHA-256: 9b6fcce59ab99a674429bc95f3b691cc1edc5f101e0f6dc057340d2287d9efc1
font_01_sfnt_off0000fd7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD7B 10792 bytes
SHA-256: 26bac7fa161dcbd289c4cbc7dea85dc9cea63a5a25d4e99edd32d370c3291fec

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