Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a4a36d9bc12c900…

MALICIOUS

PDF

67.5 KB Created: 2020-10-26 05:06:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-26
MD5: 47bdef296442c2ee2d94fa6abf0a2940 SHA-1: 70e011679d7fa82f7b062898abe4857fec5ca2f2 SHA-256: 1a4a36d9bc12c900fec7e7e9d7daaeb58d92aec4337ad1b3526368cb2b0624f5
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://cctraff.ru/pify?keyword=anxiety+coping+skills+list+pdf In PDF document text
    • https://bilewazivabo.weebly.com/uploads/1/3/2/8/132816117/7d9f320355ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367650/normal_5f8afdb6504cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383568/normal_5f8e587f4375d.pdfIn PDF document text
    • https://vezorobabuwej.weebly.com/uploads/1/3/0/9/130969079/xesob-wonuxosowavufi.pdfIn PDF document text
    • https://dejolezeg.weebly.com/uploads/1/3/2/8/132815968/vaxamedefeselob-musozol-fuvumonuravag-nasimepo.pdfIn PDF document text
    • https://fujimerikav.weebly.com/uploads/1/3/4/3/134307110/3001206.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393356/normal_5f919596d40cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382412/normal_5f9257f4a2e17.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366007/normal_5f87089b937c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393763/normal_5f8f6766c9198.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off0000ca0d.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off0000ca0d.bin)
    • https://s3.amazonaws.com/memul/60197688179.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/holt_mcdougal_algebra_1_online_textbook.pdfIn PDF document text
    • https://s3.amazonaws.com/figugipopar/the_bullwhip_effect_in_supply_chains_sloan_management_review.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/kidutuwuretibibazukogati.pdfIn PDF document text
    • https://s3.amazonaws.com/xilasisefi/jukugowetagalug.pdfIn PDF document text
    • https://s3.amazonaws.com/tesapibebujep/34748341542.pdfIn PDF document text
    • https://s3.amazonaws.com/gozilum/90991070032.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_off0000ca0d.bin)

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA0D 5240 bytes
SHA-256: 772054dd8c8c0e7e1c2e6164cc139a68c6df218f85d13657cd3b3a6c2ff21ca0
font_01_sfnt_off0000dc0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC0D 10776 bytes
SHA-256: b4c593f938be98677798fa82e567182041d2686996c4b78d16c039f41c2390d8