Malicious PDF — malware analysis report

Static analysis result for SHA-256 7404cf0009c7e4dc…

MALICIOUS

PDF

44.6 KB Created: 2020-11-02 20:32:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 7ca52b8fe68c9af3500156d8aac097b1 SHA-1: da30f33d2d92ac69029b5da2a66948be78f4daa4 SHA-256: 7404cf0009c7e4dc5ea53caab2c7f3ac0d0758d037d854ef16c4bf747459a9a3
124 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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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.com/123?keyword=trf+avid+format In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369632/normal_5f8be79d64426.pdfIn PDF document text
    • https://fewaxozane.weebly.com/uploads/1/3/4/3/134341296/637e9.pdfIn PDF document text
    • https://firedisivimi.weebly.com/uploads/1/3/0/9/130969818/budamezel-weboxoxoretosas-dikerijufuxotar.pdfIn PDF document text
    • https://turomanusogagi.weebly.com/uploads/1/3/1/4/131453559/8892025.pdfIn PDF document text
    • https://xulajaxosu.weebly.com/uploads/1/3/4/3/134366267/1e5ee0.pdfIn PDF document text
    • https://soxajenukaru.weebly.com/uploads/1/3/0/8/130874283/85a988.pdfIn PDF document text
    • https://fuvipizewovotat.weebly.com/uploads/1/3/1/0/131069886/254307.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376874/normal_5f915f81add2c.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://s3.amazonaws.com/gebukil/how_to_find_p_hat_on_ti_84.pdfIn PDF document text
    • https://s3.amazonaws.com/janodojivi/environment_and_ecology_upsc_notes.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/7222/3387/files/pujubagivurinogiru.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_off000063bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63BB 4416 bytes
SHA-256: 8cae0da49e634830ac8088dda489f1b41d01a063526966102f4eb970f24ae4bc
font_01_sfnt_off000072b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x72B4 10920 bytes
SHA-256: 3350915c779ebd5f9174e8bf3085ee1b4f2e605cac8ad2f660f29f898056a788
font_02_sfnt_off000097f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x97F1 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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