Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee7bc3331dc09a15…

MALICIOUS

PDF

39.3 KB Created: 2020-10-31 20:40:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: c2d7dce27993ba5ab255c70503b7f8d2 SHA-1: a934132485b318eb656b2bedd7093142603b6dde SHA-256: ee7bc3331dc09a156b63d69fa06415b29ace365f464acb135c3585eb9f5221c7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to redirector infrastructure or other PDFs, indicating a link farm for SEO manipulation. One prominent URL, 'https://ttraff.club/123?keyword=introduction+to+big+data+analytics+mcq', is flagged as malicious. The ML classifier also strongly indicated maliciousness, supporting the conclusion that this document is designed to redirect users to harmful sites.

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.club/123?keyword=introduction+to+big+data+analytics+mcq In PDF document text
    • https://cdn-cms.f-static.net/uploads/4377128/normal_5f990b3a8d7b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380681/normal_5f908d736c212.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376371/normal_5f8a1ea26c027.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/20190419-f91f-4427-a595-c6dbe6499c80/ferewelabisisefox.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/9614/3552/files/fafunifikes.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6189/3533/files/9th_wedding_anniversary_gift_leather.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/te_pintaron_pajaritos_en_el_aire_cumbia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9abdc5a2-2e3d-48c3-be2b-48b72027e011/mongoose_xr_75_21_speed.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6412/1757/files/88751284677.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb3df08d-21b8-4b70-93fc-d65c22644c12/12594172946.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0506/8832/7858/files/roper_rtw4516fw_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/boxufumugudemavon.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/9474/8573/files/58753733206.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/1731/2152/files/month_to_month_rental_agreement_florida.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/4096/4252/files/hill_climb_racing_hack_download_apkpure.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_off00005b43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B43 5564 bytes
SHA-256: 92ab6ae9bdf032fe3c229205e99d56b6bae336231f748bc74d58da25d699e360
font_01_sfnt_off00006e11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E11 10140 bytes
SHA-256: a1964e0383b02f4c411eb158e631ab6bb400770a8b925f3b5366196172b104a7

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