Malicious PDF — malware analysis report

Static analysis result for SHA-256 37f9941acc0ea76b…

MALICIOUS

PDF

66.7 KB Created: 2020-10-30 20:05:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-11
MD5: e316e167df8418124887d65a6468e751 SHA-1: a5e023926ecdf4133542e3eba31f6af1429cf3b5 SHA-256: 37f9941acc0ea76b88b1d0001f783841f50e11573d880a0d5ea7c0a1227ad8c9
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.cc/123?keyword=cloze-ing+in+on+science+answers In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365536/normal_5f8bb27d52014.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368954/normal_5f87a53c82683.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369901/normal_5f94a4443a7d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383146/normal_5f9ad14e19197.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384295/normal_5f98f3d8652ef.pdfIn PDF document text
    • https://vakasuvarepem.weebly.com/uploads/1/3/4/3/134328097/jezuforatav.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386080/normal_5f91f305ac1fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365620/normal_5f8f33e9169f2.pdfIn PDF document text
    • https://sutogibigasoju.weebly.com/uploads/1/3/1/0/131070189/2163499.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421776/normal_5f986358a6e81.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383699/normal_5f905ac993a39.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/3866/1527/files/aa-12_shotgun_video.pdfIn PDF document text
    • https://s3.amazonaws.com/muvojugejoxip/algebra_puzzles.pdfIn PDF document text
    • https://s3.amazonaws.com/jifesu/87737843293.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/6031/2741/files/descargar_geometry_dash_2.11_gratis_para_android.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_off0000c324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC324 5048 bytes
SHA-256: 95417c4d34d9b07bd82a48ca0fcfc4b2e9da99c55df24a820d00bf64f64a05e4
font_01_sfnt_off0000d484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD484 12388 bytes
SHA-256: 2ef08ccddf78259ef19c9b45b4ddd0eb0b5a70e8f2c55906ded847f97e915c94

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