Malicious PDF — malware analysis report

Static analysis result for SHA-256 c15fa7e586578713…

MALICIOUS

PDF

41.7 KB Created: 2020-10-30 07:02:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-02-23
MD5: 91ed750af64bdaae5a6bb1702a73df45 SHA-1: 4f83358b43beb30f5466e3e1746694ba997fa069 SHA-256: c15fa7e586578713c4ca8a90656fc0ef9ec0c6ac8b98800491fd33c7280a7e6b
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=lifeline+activity+counselling In PDF document text
    • https://jirunemopisitex.weebly.com/uploads/1/3/4/3/134332051/1675762.pdfIn PDF document text
    • https://jatorogerujew.weebly.com/uploads/1/3/2/7/132710569/8c3f11ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368949/normal_5f88fa6ecdb0d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/belopudevuzuza/8717998105.pdfIn PDF document text
    • https://s3.amazonaws.com/tiluwisulepam/beata_pawlikowska_ksiki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55263519-4450-4852-bc4e-072ce7f37fd4/favagumofudixesafex.pdfIn PDF document text
    • https://s3.amazonaws.com/zesotat/alleluia_magnificat_emmanuel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12095359-f6f1-4bb1-939e-2b48f38c0eb3/air_masses_and_fronts_worksheet_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c2cb043-11b0-4b81-afdc-62b63ec5ede2/kifepebetu.pdfIn PDF document text
    • https://s3.amazonaws.com/pibabopuduj/91398342202.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a7f322d-e7bf-4bb0-a9a8-787c4082f17b/vilivuvufevunedifowo.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_off0000660b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x660B 5056 bytes
SHA-256: ec6095ba6a5b8bbc7628a22af8c2ffaf7eb037eb8fd15a67ab4325aefdbaaae0
font_01_sfnt_off00007773.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7773 10304 bytes
SHA-256: 3248869575b9596cacb057fe2d4308ee45bf37cf242da6ced4022cd3f5a48a16