Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf3cfd0ade82db0a…

MALICIOUS

PDF

45.3 KB Created: 2020-10-26 21:41:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 299b35ee4cb0e0abee982c499cbdf48f SHA-1: 9350afc4a54a199c167212b186aed77357ad032e SHA-256: bf3cfd0ade82db0ab8c2a1f7d68ea2547ae190ddcf7f9ff1d0494e6b728b8c52
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically directing users to 'https://ttraff.club/123?keyword=ms-7596+cpu+support'. Additionally, it exhibits characteristics of a PDF SEO link farm, embedding numerous links to external PDFs, likely for traffic generation or further malicious redirection. The ML classifier also strongly indicated maliciousness.

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=ms-7596+cpu+support In PDF document text
    • https://kuzewejutoba.weebly.com/uploads/1/3/4/3/134398832/dusafokiv.pdfIn PDF document text
    • https://jivexine.weebly.com/uploads/1/3/1/3/131380908/2964153.pdfIn PDF document text
    • https://temazojirilezin.weebly.com/uploads/1/3/2/3/132302863/9168672.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369769/normal_5f94290a8b4e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372963/normal_5f8911c696923.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382406/normal_5f96702a3e2fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367311/normal_5f8764eecfaac.pdfIn PDF document text
    • https://sakukavazu.weebly.com/uploads/1/3/1/3/131379729/6385243.pdfIn PDF document text
    • https://korodaziso.weebly.com/uploads/1/3/0/7/130740443/7179007.pdfIn PDF document text
    • https://zirufifun.weebly.com/uploads/1/3/0/8/130874679/pobepifipatamu_bumixoxajofusa.pdfIn PDF document text
    • https://mupififidimob.weebly.com/uploads/1/3/4/2/134234858/db375382910.pdfIn PDF document text
    • https://numibogag.weebly.com/uploads/1/3/4/3/134323011/6213318.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/efb49027-b7fe-4c6f-9988-0e830c451fd5/brazzerspasswords_2019_hack_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1051c366-d400-45e3-a256-d1044d74634f/18025226167.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bee12d41-aa2d-496a-9153-f71f2f20290e/13200386299.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7650/1158/files/futifufumalur.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/1647/8110/files/fuzzy_logic_and_neural_networks.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/3586/0378/files/appium_on_android_emulator.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9411/4455/files/history_of_chinese_economy.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3276/3816/files/tobajisawe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/4725/4688/files/97321816643.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9603/9833/files/nomivipolekabiga.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/8711/2613/files/minecraft_witch_house_tutorial.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4654/2229/files/runescape_android_early_access.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/1684/5469/files/95717446835.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_off00006ef6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6EF6 5236 bytes
SHA-256: e46febf52ba5abd09083524c0e27c4fad892b7c4f501b4f59cbf5b3750d4646f
font_01_sfnt_off000080e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x80E2 11612 bytes
SHA-256: ff970f4d07593f9ac28db9715215f2ade0cdacf46f2ae96654653d24dff8a56d

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