Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8d786a74ffd06ca…

MALICIOUS

PDF

36.1 KB Created: 2020-11-03 12:33:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: ed6aa53b60425d797f6d475ff8ad6c34 SHA-1: e696ed369a7a5af2f6b864346a28dc0ad16510ea SHA-256: b8d786a74ffd06ca79d0a81d0085b5f0cd4d9929059419354d9272ff34abdbae
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded URLs that lead to a known malicious redirector, disguised with keywords related to sports scores. The heuristic firings indicate this PDF is a malicious redirector and part of a link farm, aiming to drive traffic to malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest an attempt to redirect the user to a malicious payload or phishing page.

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://ggtraff.ru/strik?keyword=rabun+county+high+school+football+score In PDF document text
    • https://bazademirijef.weebly.com/uploads/1/3/4/4/134464354/62d677.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vedexajawo/are_fungi_unicellular_or_multicellular_organisms.pdfIn PDF document text
    • https://s3.amazonaws.com/pusori/zukezojerameni.pdfIn PDF document text
    • https://s3.amazonaws.com/lipekipuvenuji/blocked_games_parking_media.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d2534a4-06d8-4266-b733-fa5710d6c8e9/18239797405.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/22673499174.pdfIn PDF document text
    • https://s3.amazonaws.com/xefejevife/cornerstone_chords_d.pdfIn PDF document text
    • https://s3.amazonaws.com/zufojadibi/byomkesh_comics_download.pdfIn PDF document text
    • https://s3.amazonaws.com/tibitexil/frozen_para_colorear_descargar.pdfIn PDF document text
    • https://s3.amazonaws.com/kudowo/vubilirenefi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2ae8652-c500-44fa-8868-2242190cd07c/zokuxetejevivolido.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_off00004d58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4D58 5392 bytes
SHA-256: 6095ff3648562d3d271abf5fd820aedb68dc028f2f471d02376e245d31557b28
font_01_sfnt_off00005fbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FBF 10676 bytes
SHA-256: f2c633dadcfbcd01a7b67e17bfcb2424d04d1c791a340fea646c3cfe53649977

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