Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1cc5e036e1261b4…

MALICIOUS

PDF

41.8 KB Created: 2020-10-30 19:17:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-26
MD5: 0f65cae0e65f2dfd2beb69859cb74b66 SHA-1: 76b21ad07cd34ad2f46298e7c512640cd026c478 SHA-256: b1cc5e036e1261b4e516503616b8cdd5a51c3a1b0b1f4129acdd8ffea5ff39a2
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://ttraff.me/123?keyword=run-on+sentences+worksheet In PDF document text
    • https://cdn-cms.f-static.net/uploads/4373987/normal_5f8f567e5a2d2.pdfIn PDF document text
    • https://vilukenuxe.weebly.com/uploads/1/3/2/8/132814007/1352491.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off000058aa.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off000058aa.bin)
    • http://www.daltonmaag.com/In extracted file (font_02_sfnt_off00008c0a.bin)
    • https://s3.amazonaws.com/zamuriza/faceniff_unlocked_apk_2.4.pdfIn PDF document text
    • https://s3.amazonaws.com/begijufadi/mitsushiba_golf_clubs_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b6b8ce2-f83e-4237-8f2c-6f7a98419ee6/venivinelidobit.pdfIn PDF document text
    • https://s3.amazonaws.com/jivuxo/excel_function_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6cc9ce28-6dd7-4eb1-9da2-7410603cec95/58350949518.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/tabozinaxijegepirut.pdfIn PDF document text
    • https://s3.amazonaws.com/dobesogum/89780802932.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/88293994414.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a06edd8e-2f15-4eee-9d37-02293345c042/49535159726.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/wipajasum.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 extracted file (font_00_sfnt_off000058aa.bin)

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000058aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x58AA 4672 bytes
SHA-256: 8bf992565158c732c992b9dcf986afc2d9b69923c44555f497f38392b42fa2cc
font_01_sfnt_off000068aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x68AA 10428 bytes
SHA-256: 5191a56c2a8670c47327c042068e0afa1a5d30fe5d41976d6aee08461406c982
font_02_sfnt_off00008c0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C0A 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c