Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9d99c2605de2633…

MALICIOUS

PDF

44.3 KB Created: 2020-11-01 22:15:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 3a5f49b868df66edb4171106bde88c5b SHA-1: d7c108e756a1c48281d5d2b80f2420d44811fa21 SHA-256: c9d99c2605de26339c8b73e7efbfbff14d172150e7251de057e4151f63bcd667
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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://ttraff.club/123?keyword=elmer+batters+stocking+photos In PDF document text
    • https://rokufekajo.weebly.com/uploads/1/3/0/8/130814342/51eb3f15ae79b.pdfIn PDF document text
    • https://fafugugopogewip.weebly.com/uploads/1/3/4/4/134464831/bosiderajuxi.pdfIn PDF document text
    • https://firedisivimi.weebly.com/uploads/1/3/0/9/130969818/xawemefezepime.pdfIn PDF document text
    • https://kokexofagisukop.weebly.com/uploads/1/3/2/7/132710589/dozusawofip_gadekinukekiwop.pdfIn PDF document text
    • https://murikupa.weebly.com/uploads/1/3/4/4/134481598/mobefatexor_sinaj_ganebuv_giverenisu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/51ed9b76-051c-4118-815f-77494b892d1b/gta_5_download_apk_without_verificat.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/8030/9675/files/werbung_blocken_chrome_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8cff204-ba81-4d8e-b91d-d59bec58d885/81988763683.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/6065/7820/files/94656015938.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/9562/0253/files/39267326829.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005ffa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FFA 5296 bytes
SHA-256: c27cf724dd2eef5bcdca0663bef4d656ca3174afceb17ab65eb8b59551f2571b
font_01_sfnt_off000071c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x71C0 10884 bytes
SHA-256: 1eee54cde08f81777fb076dea9584fdf39ce1ea80c0acf540221c61d3b1c81e1
font_02_sfnt_off000096b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x96B6 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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