Malicious PDF — malware analysis report

Static analysis result for SHA-256 0dc0e736ba5d969a…

MALICIOUS

PDF

39.7 KB Created: 2020-10-31 20:36:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-03-01
MD5: d65e70105ffe32b05dd838b090b66e84 SHA-1: e98e3ee23f1b44f25953a6b5d5191b395b3b219e SHA-256: 0dc0e736ba5d969a34630124cab0c0a83db89eb265dcf90f869ca29529920bb4
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=letter+of+intent+for+teaching+promotion In PDF document text
    • https://cdn-cms.f-static.net/uploads/4367919/normal_5f881d7441523.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392656/normal_5f8fa9961f3f1.pdfIn PDF document text
    • https://kutepazibug.weebly.com/uploads/1/3/4/4/134477769/nowaxasar_xabapiv_dedel.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389793/normal_5f912f9c3dcd5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368506/normal_5f9a9fe60a95d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369512/normal_5f89c6e09d78d.pdfIn PDF document text
    • https://soxajenukaru.weebly.com/uploads/1/3/0/8/130874283/kinafegenuvux-laxipigit-roxuribogaw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368740/normal_5f886b77c2682.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/d9b8d2ca-ede4-46ef-a4a6-ee5236ab286c/65926821356.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da1ffec3-071c-4f7e-b439-d6aa8a49c888/97101702912.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/7771/2068/files/free_worksheets_fractions_on_a_number_line.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005e62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E62 5160 bytes
SHA-256: 5978732bb0305159ab5bd1ade00a34248964fca57957071468748bd79b0f1b7c
font_01_sfnt_off00006fd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6FD1 9972 bytes
SHA-256: 1e303985c430395936aee514707c70389482d93fea996bcc5b1b3639805872c1