Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a33823a0894f1d9…

MALICIOUS

PDF

53.3 KB Created: 2020-11-09 00:26:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: a534b87cd9e294b1d83e384967b6cdaa SHA-1: 9ce9b4884df18d004eac721c00bb85d2c9b615ad SHA-256: 5a33823a0894f1d927fa3a833cf2ffbec49f96a9e6b963ddf8089b0ccb1d0d04
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=product+manual+cover+design In PDF document text
    • https://bijivabaj.weebly.com/uploads/1/3/4/6/134601785/negejefiki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426572/normal_5f9b1412a7fd0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458614/normal_5fa1076433a67.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://siwereja.files.wordpress.com/2020/11/movizedopeviv.pdfIn PDF document text
    • https://fujixowezizu.files.wordpress.com/2020/11/50274751067.pdfIn PDF document text
    • https://tutariwanop.files.wordpress.com/2020/11/dedazabexoroju.pdfIn PDF document text
    • https://xoxedoxiki.files.wordpress.com/2020/11/dr_faustus_short_questions_and_answers.pdfIn PDF document text
    • https://fidunonip.files.wordpress.com/2020/11/8625666511.pdfIn PDF document text
    • https://xivikutedito.files.wordpress.com/2020/11/ecommerce_startup_business_plan.pdfIn PDF document text
    • https://s3.amazonaws.com/zikeko/game_developers_conference_2020_canceled.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/batman_vs_superman_comics_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/mefadedosuw/49634465243.pdfIn PDF document text
    • https://s3.amazonaws.com/jarawaxanivu/78361140755.pdfIn PDF document text
    • https://zuwumatola.files.wordpress.com/2020/11/livro_pneumologia_download.pdfIn PDF document text
    • https://s3.amazonaws.com/wotodedaruzuk/18157746728.pdfIn PDF document text
    • https://s3.amazonaws.com/tejuvonixag/8264795255.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000068db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x68DB 6744 bytes
SHA-256: b29f9350a720d2da9dc50567d08c4a82684db1fcb28a47e3a5788345b392d808
font_01_sfnt_off000079c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x79C0 5320 bytes
SHA-256: 720e027998cfbd571266d715952d474f6b607633857a6f0c416ea19b7178e799
font_02_sfnt_off00008bb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BB8 6596 bytes
SHA-256: ac13e940edb10e3a08f7df92bcb11925ac59c6785d78adf89ca94c95a100c5c8
font_03_sfnt_off0000a2ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA2AB 10288 bytes
SHA-256: ad0020fa7035771884ed4d1c4a6db5a722e3d96cea333c336d13a7d46070b495

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