Malicious PDF — malware analysis report

Static analysis result for SHA-256 b81165415dd30565…

MALICIOUS

PDF

42.2 KB Created: 2020-11-07 13:19:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: cda649cf0cac1cf43bdf05b32ffeafa4 SHA-1: d9ed192e49980ac56ffc7b73fab4cadbcae17428 SHA-256: b81165415dd3056552e9a84f1d674210e27d20d7ced51ec3bc600dd6b453ac8e
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://ggtraff.ru/123?keyword=unblocked+stick+games In PDF document text
    • https://piziruzebizopu.weebly.com/uploads/1/3/4/3/134350425/0024ba77a.pdfIn PDF document text
    • https://luwobidope.weebly.com/uploads/1/3/0/8/130814225/xafube-befonotuge-zibotubujos-seboke.pdfIn PDF document text
    • https://nupejaxisolerez.weebly.com/uploads/1/3/4/3/134348845/gukitifasaxodemezox.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/wozibap/beckett_monthly_price_guide_basketball.pdfIn PDF document text
    • https://jopafez.files.wordpress.com/2020/11/15872170774.pdfIn PDF document text
    • https://fidunonip.files.wordpress.com/2020/11/madelizopididam.pdfIn PDF document text
    • https://rezekine.files.wordpress.com/2020/11/tatojesanawav.pdfIn PDF document text
    • https://s3.amazonaws.com/pojojagajevuxa/zigabakanajenuginejomawa.pdfIn PDF document text
    • https://s3.amazonaws.com/towakog/jisibopevunogetonofefepek.pdfIn PDF document text
    • https://s3.amazonaws.com/texifaxepag/16750062965.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1280b1d9-668e-4951-820d-9d4c308d0aa2/data_flow_diagram_explained.pdfIn PDF document text
    • https://vadazigifexe.files.wordpress.com/2020/11/gopiv.pdfIn PDF document text
    • https://s3.amazonaws.com/vifusupegiza/manorama_year_book_2017_download.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_off00006564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6564 5356 bytes
SHA-256: 7ebe427976a0badf3f00af607997f76e8afd3a6ef5279c4e47aedd410ee2d60b
font_01_sfnt_off0000778d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x778D 10832 bytes
SHA-256: 8016f7b003e3d85b7df2889934c28cef765b2034f6325348c7ac163e5865728c

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