Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b9f3a441140c666…

MALICIOUS

PDF

49.7 KB Created: 2020-10-27 06:02:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: e391d56aacd777000bb65cf9979928e3 SHA-1: d4eaed3c47a38ea102b551cb5497e31fdf3638a7 SHA-256: 7b9f3a441140c666e4d24b3d43f59b6d630e37093ed4ea02e6179bfe64dc25dd
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.cc/123?keyword=red+coats+from+pride+and+prejudice+world In PDF document text
    • https://cdn-cms.f-static.net/uploads/4383470/normal_5f8be51157f62.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381302/normal_5f8f428e52e58.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403808/normal_5f96c815cd66e.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/tudawufed/kiran_bpsc_question_bank_download.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/53126914203.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/ashrae_62._2_2013.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/cie_further_mathematics_textbook.pdfIn PDF document text
    • https://s3.amazonaws.com/fulosobezur/60815759710.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab0202cc-b8f9-4484-99ad-e57afc361af2/94971114254.pdfIn PDF document text
    • https://s3.amazonaws.com/dadupawo/19335578293.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/45783285263.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/1229/2260/files/lego_republic_gunship_2020.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2435/0375/files/virginia_dmv_registration_fees.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8520/9507/files/qy7_bluetooth_headphones_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/busutafitufe/samsung_tablet_cannot_open.pdfIn PDF document text
    • https://s3.amazonaws.com/lejivugeleguwod/zafopufezagakowo.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/advantages_of_computerised_accounting_system.pdfIn PDF document text
    • https://s3.amazonaws.com/podawakumepewez/buwana.pdfIn PDF document text
    • https://s3.amazonaws.com/lanorolowu/zugukazaposiv.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_off00007ff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7FF6 5476 bytes
SHA-256: 5a38ed1ddbb79f91baa512d55b60d9d96f4c0efc9d113e618164a69ae117a4bf
font_01_sfnt_off00009289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9289 11612 bytes
SHA-256: d931cbd4e395b2135bdaec98a146d6e1069762fa9278bf77884d1d64b2350a04

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