Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e909845607cabf1…

MALICIOUS

PDF

50.7 KB Created: 2020-10-26 09:57:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-26
MD5: 2644a555e082d3b9a0c88e16cf97c0f2 SHA-1: 87ff7c1df815aae0b952293654fe74d191d401ea SHA-256: 4e909845607cabf14f26353602dee5348efdee0f6e760a1ccb4f7f19771c9a69
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/aws?keyword=athlean+x+leg+workout+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366324/normal_5f880c5fb8f90.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370307/normal_5f912b51c4d98.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369766/normal_5f8af305f1cba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379485/normal_5f956dd8eeaed.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off000086bc.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off000086bc.bin)
    • https://cdn.shopify.com/s/files/1/0433/1608/4891/files/invader_zim_house_box_set.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/7221/2132/files/47484199182.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/1875/0616/files/toramawoletativiluzoba.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/8391/5962/files/graphic_designer_portfolio_ideas.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/9929/4363/files/vupulezoxenigomavet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/8050/5275/files/vowegafala.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/7446/8037/files/2020_mitsubishi_outlander_sport_se_owners_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/4002/9851/files/dugixisivube.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/4246/2618/files/71831327200.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4532/9832/files/65367568021.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/8140/9713/files/kali_linux_download_for_android.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/1701/3912/files/62011716455.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/0343/2088/files/suzino.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0465/0241/2446/files/40_hadith_transliteration.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/17149335075.pdfIn PDF document text
    • https://s3.amazonaws.com/belopudevuzuza/cancer_de_colon_signos_y_sintomas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1caff8cb-a9e6-4c15-94bd-1ef049bb62bd/49782009744.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb1f59ef-94f9-4eab-a113-b44334c408a9/welowinuposoxok.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_off000086bc.bin)

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000086bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x86BC 5336 bytes
SHA-256: 3007a35617be6edc9ffa8f2d9f6fb4c29fc2973625be27f1c71fdd5ad2122b79
font_01_sfnt_off000098f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x98F4 10672 bytes
SHA-256: 72e8359b04f1260d888e6d72e6aa270a6df6241ca0d667eb539275cd849843ef