Malicious PDF — malware analysis report

Static analysis result for SHA-256 42aa091b3313d411…

MALICIOUS

PDF

59.4 KB Created: 2020-10-29 02:02:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 31e53f929d68be50da62f15157bc750c SHA-1: 2e2f4503939c1f79826e7e6e095d892b89b0d6ff SHA-256: 42aa091b3313d411ea4e42c16cf55d92bf0424dec79c00eeac6450ea38ff83f9
94 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a heuristic firing for a malicious redirector link, pointing to 'https://cctraff.ru/strik?keyword=biografia+de+torricelli+wikipedia'. The ML classifier also flagged this PDF with high confidence. While no scripts were extracted, the presence of the malicious URL strongly suggests an attempt to lure the user to a harmful site, likely as part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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://cctraff.ru/strik?keyword=biografia+de+torricelli+wikipedia In PDF document text
    • https://rimenedefogifu.weebly.com/uploads/1/3/4/4/134466040/xarewowatutat-zuzis.pdfIn PDF document text
    • https://zesopupejilit.weebly.com/uploads/1/3/0/7/130738861/3225387.pdfIn PDF document text
    • https://valoxapemep.weebly.com/uploads/1/3/4/3/134305175/3752038.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369173/normal_5f87a33e46ff0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383314/normal_5f8c9e6b6572c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373769/normal_5f9129e18c5c3.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/sukobogixe/nisaka.pdfIn PDF document text
    • https://s3.amazonaws.com/fodose/anganwadi_application_form_2017_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/960ec9c5-6a6b-4048-bbe1-4f104535c80c/9477663276.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08984386-1af7-4254-ba54-781afc42a0bc/proper_adjectives_worksheets_with_an.pdfIn PDF document text
    • https://s3.amazonaws.com/zalomi/ice_staff_code_roblox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ff9bdff-31d1-474c-8e9b-724876465376/darkest_dungeon_shieldbreaker_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/sasufufa/changeling_the_dreaming_2nd_edition_download.pdfIn PDF document text
    • https://s3.amazonaws.com/lopazura/45964902362.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/wilimirifewapewitobabe.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000906d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x906D 5352 bytes
SHA-256: 01780f411bec499698deeeca8fbed6de328186efdc4d6fcb89b8fe36e0bdb8a9
font_01_sfnt_off0000a2cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA2CD 12628 bytes
SHA-256: 4f316a153a4c8ff846cf14a978ff04d2985d54ab23983ae3f4ef1a8cb780acc5
font_02_sfnt_off0000cbc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC3 16084 bytes
SHA-256: 249651805b0a8f5b4743f17da7e3943b18be49f9c75a96c0f18a2f62b87e55bb

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