Malicious PDF — malware analysis report

Static analysis result for SHA-256 b61f8e864bca0da8…

MALICIOUS

PDF

42.3 KB Created: 2020-10-03 03:28:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: b5cdef8660c7dc93183cd76b80f4436c SHA-1: e7a32657197b36d955e62d503604b06e7d83901b SHA-256: b61f8e864bca0da854fc3d834314fbe7cf7293e81cfd93c94c6b631c37a8d648
194 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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/strik?keyword=ed+mylett+book+pdf In PDF document text
    • http://xuboni.kyocreations.com/uploads/1/3/1/6/131606177/fatukisafi.pdfIn PDF document text
    • http://files.kyongburke.com/uploads/1/3/2/8/132815866/3556492.pdfIn 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://uploads.strikinglycdn.com/files/9b64c4c8-0c8d-4658-a9c1-b0ca8ee0ba4c/gopuviminovujikitodugezu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e28ee29-1100-47ae-87d2-3e02ac19d5ac/tavomaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14658bc0-b0c8-475b-8bef-32b2accc50a3/68008204935.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72a82dcb-5ebb-433c-babc-5026b61ae957/12377576246.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f39d74d2-7c85-460f-a0c5-3ab5e1b902c8/93348337567.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c95a76ae-ddf5-436e-bff3-df0b328d56cb/vonarewefenudomopudobuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dae79216-88db-4618-8139-11db97b01540/sodim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0fdbfd39-a005-4bd3-880e-f1e123da1209/28127895077.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/1241/4376/files/xezudavefoxikab.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8402/9854/files/us_polo_assn_watch_us9061_manual.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_off00005a46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5A46 4600 bytes
SHA-256: 97e6acc0b6ccf35ffd6f1df5180e30e1ca414c2cc9d23cce877e20af33f09e93
font_01_sfnt_off00006a02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A02 10712 bytes
SHA-256: 38c74c0ca937e3d00dae68301bdaacc54f5d5a39fa69771a644a7b9005228f5c
font_02_sfnt_off00008e9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E9D 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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