Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d68c028041958d6…

MALICIOUS

PDF

41.3 KB Created: 2020-11-02 15:41:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 2dd2e758a4c8d9f6fab0664d763918fb SHA-1: 0c68eabe37c8efd18d7764eb8a906ed2b35ba795 SHA-256: 6d68c028041958d67ea216ba9592e82a4218f674ec0229e1016f824bce3c1ef0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by an ML classifier and contains a large number of external links, characteristic of a link farm. One of these links, https://cctraff.ru/123?keyword=ankheg+d+d+5e, is identified as pointing to known malicious redirector infrastructure. The document body itself is heavily obfuscated and appears to contain embedded URLs, but the primary malicious indicator is the redirector link.

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/123?keyword=ankheg+d+d+5e In PDF document text
    • https://suludizivot.weebly.com/uploads/1/3/1/3/131383823/3e3f00e9db.pdfIn PDF document text
    • https://daletutanedura.weebly.com/uploads/1/3/1/6/131636587/db012.pdfIn PDF document text
    • https://nadazilagola.weebly.com/uploads/1/3/4/3/134314388/seliwusu.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/857c6b78-4a13-4c9b-bb0b-28e7ff50b620/23208580036.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/7631/8900/files/giruber.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/962a1d14-3e3e-4534-83d0-04aaf5540079/bavudodetoweso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a426021-50ed-4122-b3d2-684da7b6a30b/transformada_de_fourier_matlab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86be42ea-729e-4547-bd9b-c94fe7d8997a/66788755262.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0423/9783/files/vakevoruribodakizevoguxus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a247d273-d311-43d0-b4b4-22777254adc2/dexter_season_1_torrent.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/4948/2938/files/73228166986.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e689798f-6faf-4154-858c-5fd25e5cd986/59857710998.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_off000064b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64B1 4748 bytes
SHA-256: fed93e17e19c03a481f87f6981c546dbc7ea30e2d46ad016ce8e72b6687ced28
font_01_sfnt_off000074df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x74DF 10640 bytes
SHA-256: 850ed715ddf98111187df69c6417985a9b53d23fb1ee002e332b0a8875bad15a

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