Malicious PDF — malware analysis report

Static analysis result for SHA-256 81a385b6ece442f4…

MALICIOUS

PDF

38.2 KB Created: 2020-10-29 16:12:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 7be6a0efb0a49fdf0fc44712b8389ad8 SHA-1: 442f42fdf1326a1b73602236e53dc6e4069a87ed SHA-256: 81a385b6ece442f470212a02c29bb058f1c1bd23c98244f43da1910d9a2a2684
184 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, many pointing to disposable hosting services like Weebly, and at least one known malicious redirector. This indicates the document's primary purpose is to act as a link farm, likely for SEO manipulation or to lead users to malicious content. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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://gettraff.ru/aws?keyword=unit+7+test+study+guide In PDF document text
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/dekegu.pdfIn PDF document text
    • https://sesuwulot.weebly.com/uploads/1/3/1/4/131438847/jeziwaradovagu.pdfIn PDF document text
    • https://jukafubu.weebly.com/uploads/1/3/0/8/130874261/kalowemixuluted_vanosu_banapaz_mixarunugabudi.pdfIn PDF document text
    • https://setumimirakav.weebly.com/uploads/1/3/2/6/132681532/kepubafujin-jotelip.pdfIn PDF document text
    • https://bokixewabukogu.weebly.com/uploads/1/3/4/3/134341992/cdea8533064e1.pdfIn PDF document text
    • https://xopigitit.weebly.com/uploads/1/3/4/3/134339451/kijalazurubozu.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/28e681c2-2270-4023-b4ae-62559231d7be/kegafivujodamuvomizuxe.pdfIn PDF document text
    • https://s3.amazonaws.com/sugowubuf/basel_ii_pillars.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2536/6165/files/kepajosivevunijujut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60a40b9d-656d-47f3-9d2a-168f14b9892c/rewugikebilelunuxodatif.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005a2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5A2B 4828 bytes
SHA-256: 0b0ea7cba169b0a27445bba01605226283114fd0b41bae8180754c42cdc387da
font_01_sfnt_off00006abe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6ABE 9872 bytes
SHA-256: 659464e2a60c647717ad4fcfd45e8bdff071195d68ed90608ec63cc741cd80d1

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