Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e053ab6156e9d77…

MALICIOUS

PDF

50.4 KB Created: 2020-11-03 08:20:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: d3b2a80373d13b1629e2f5fa805380d8 SHA-1: 9ba528b2c520971616a462913e01537a04536871 SHA-256: 7e053ab6156e9d772d0a758e9c200e4c9e7e1f113c18b77529fb397fac89fac0
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The ML classifier strongly indicated maliciousness, and the presence of a link farm suggests an attempt to manipulate search engine results or distribute malicious content. The embedded URL https://ttraff.ru/123?keyword=pocket+guide+to+nutrition+assessment is the primary IOC for this redirection attempt.

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.ru/123?keyword=pocket+guide+to+nutrition+assessment In PDF document text
    • https://milorupubi.weebly.com/uploads/1/3/4/3/134317418/7454127.pdfIn PDF document text
    • https://xibopenevitamog.weebly.com/uploads/1/3/4/4/134488628/sedepariwab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376606/normal_5f8b235b5b75d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379374/normal_5f9c51e132629.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388612/normal_5f9250b770e6f.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/302f5123-94b9-4975-81ef-e0076e003b0a/intermediate_accounting_chapter_14_s.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33570c6d-0e92-4678-aef4-4e6a19b03dfa/kawozorivif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc45dd3a-dc94-442c-8f9c-5c9550cf1b40/percy_jackson_and_the_olympians_the_ultimate_guide_weebly.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dcbf8875-437c-49e4-ad28-db16c1ec251a/dividopukivobubato.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0505/1383/8276/files/jessica_simpson_purses_belk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca2d9c54-826b-4bf5-8e20-3d368367f8d0/fadubokupatupofoxufanin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf2a6f1b-38cc-41a0-9569-d06f07236d3f/45509777774.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e88932b2-0d76-4dc0-8b40-35f13430191e/cheap_go_pro.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/9431/3627/files/professor_messer_network_n10-007_course_notes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c85beb18-8445-4491-a22b-e3ceab8bc4d2/25732982177.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_off00006e15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E15 5292 bytes
SHA-256: 2c53de3168c4a63040a9c8ff5cd1d4b8f9bd1719628e105ad8f48e04ba4bec55
font_01_sfnt_off00008003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8003 11812 bytes
SHA-256: 147bcb21f24fb9b293cf77bba83dbf9a93eb980807951fb925c8fe69411c72dd
font_02_sfnt_off0000a7db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA7DB 16068 bytes
SHA-256: 03a5ddad4a2a9171a93ce60914583e3601ab986f29a2c4cb248efc8e19c0a50a

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