Malicious PDF — malware analysis report

Static analysis result for SHA-256 28ebcf4259027f0b…

MALICIOUS

PDF

49.7 KB Created: 2020-11-08 00:06:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: be53101b331084d7dfaa5242d081a7e8 SHA-1: 106cc91c40cac72aff149412e6dd3d58fff363c5 SHA-256: 28ebcf4259027f0b94a07b2cc0cec8b651d8994c56adc5d4a6bdf5aa2634ac31
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 links, including one to a known malicious redirector at 'https://ggtraff.ru/aws?keyword=cmp3+math+grade+6+answers+page+27-28'. The document body also contains this URL, suggesting an attempt to lure users to malicious sites under the guise of providing search results. The ML classifier strongly indicates maliciousness, and the presence of a link farm further supports a malicious intent.

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://ggtraff.ru/aws?keyword=cmp3+math+grade+6+answers+page+27-28 In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://bimokiwadodu.files.wordpress.com/2020/11/usb_joystick_driver_windows_10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b673e32c-b32d-40b3-bdf5-baef343f62ac/basic_english_grammar_book_3_for_children.pdf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/464950eb-1197-4b60-9a85-2c5244f275f1/repelemigutudu.pdfIn PDF document text
    • https://s3.amazonaws.com/sazixipame/nemodibafesipuged.pdfIn PDF document text
    • https://sevuropigo.files.wordpress.com/2020/11/kexiwozopapukis.pdfIn PDF document text
    • https://s3.amazonaws.com/posufij/5785286420.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4019897-c00d-41e9-95d3-70442aefb84e/90467631889.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35e556ee-f9b9-4ed5-a6d5-091a0aa3d251/personality_development_books_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/996c5c5e-83f7-4c02-9815-53a12729750a/kagolunori.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b0addf3-3059-4f55-9727-2d3f56ac6b1b/7358478356.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67ff1462-f78d-4bea-aa86-03e012fd9d8f/73888335274.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af565256-ba70-4d60-8ebb-3a4d49ad2299/visual_boy_advance_how_to_fix_white_screen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1e758da-0ece-4098-8d12-8ad26af0e4cf/8115370608.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000738a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x738A 5840 bytes
SHA-256: 08262e3304ca13a8d69eb71a77535556b4c1976f89b0293a5358749653601a0e
font_01_sfnt_off0000874b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x874B 10620 bytes
SHA-256: f4bed7a027aceb8de76435d420ad58fac71e19221d06e434df6a8993d7753492
font_02_sfnt_off0000ab91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB91 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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