Malicious PDF — malware analysis report

Static analysis result for SHA-256 82098b9a4ff08750…

MALICIOUS

PDF

53.0 KB Created: 2020-10-30 18:54:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: b3ed02b4f0aebfec827524e757ed4720 SHA-1: 20828b46e99ea9a8344b659c54657f9600657578 SHA-256: 82098b9a4ff08750056e1b528fee40ad707d7f92911a96b4af89a65db96e448f
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.com/123?keyword=goku+games+unblocked+76 In PDF document text
    • https://nixofukotozawe.weebly.com/uploads/1/3/4/3/134313466/xipamido.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422378/normal_5f96ca0e727ec.pdfIn PDF document text
    • https://wazuwivanesigov.weebly.com/uploads/1/3/4/4/134431766/juputotuweno_zupotadonilevi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/5940/3157/files/80424470809.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0493/1921/5265/files/windows_10_ltsb_licensing_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be5d8314-1255-4155-a7e4-03a843ecf5e3/68753548680.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bcc54a4d-ceea-4d92-840b-57380f615538/muwuwujurixijuvudin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2ba4b4c-1a97-4a4a-8031-c61581a0f420/repufukotaz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/3427/4723/files/20724373106.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0505/4441/0806/files/best_western_seven_seas_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0232f85-e0d0-494d-89bf-046c361c958e/78186943855.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0492/2913/6028/files/66093074908.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7241/3079/files/gulilazuzazojezagajara.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f9f625b-9a43-4656-8171-9f211e8818a2/baixar_the_l_word_dublado_gratis.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006cd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6CD4 3016 bytes
SHA-256: a57176794fb7a013e93cca151452ceab3ae41f145674f294752e3d0a0dd59424
font_01_sfnt_off0000778f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x778F 5632 bytes
SHA-256: 7faedc1430549ea25f8764aa2c4480628a32e2e60e6bb8e513e24324bdff1726
font_02_sfnt_off00008ab8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8AB8 11532 bytes
SHA-256: bc929b38ded0858e2c14fb2b9ca017f15047b1bffc91bddb638413a4246ff3ae
font_03_sfnt_off0000b049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB049 16036 bytes
SHA-256: bc1c1644e30597ae0beaac312b9749a82b64e26c109397326cdc67fdbaf2fe17

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