Malicious PDF — malware analysis report

Static analysis result for SHA-256 d46fbbdb77c3d613…

MALICIOUS

PDF

40.9 KB Created: 2020-08-11 08:46:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: ae6b5eb0e0b354dd06128c6781be0f6e SHA-1: 6a9cd977115aced941787615718873f9ceffb779 SHA-256: d46fbbdb77c3d613a54875e96a79d17fa531490db7095a08e205bbf5b69d3dee
234 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.ru/pify?keyword=banking+diploma+books+pdf+free+download In PDF document text
    • http://fosari.heshooktheworld.com/uploads/1/3/0/8/130814328/6175615.pdfIn PDF document text
    • http://jewev.smareachuk.org/uploads/1/3/1/4/131453645/refeb.pdfIn PDF document text
    • http://felaguv.childrenandthechurchpublishing.com/uploads/1/3/0/7/130775506/lirozop.pdfIn PDF document text
    • http://files.n-a-o-f.com/uploads/1/3/0/8/130813448/vukumedubu-janunixib-sebiwiluremeweg-niretisapewe.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/1/0435/4041/4615/files/nesini.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/1760/1181/files/jquery_scroll_to_bottom.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8893/7120/files/87984400274.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/9657/0024/files/15834794982.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/1700/2405/files/wadezinat.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/1701/1353/files/64749950915.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1555/2672/files/56535719733.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5057/2695/files/maharashtra_state_board_11th_biology_textbook_free_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3636/0351/files/27315060797.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2128/7080/files/76293947308.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/9095/8749/files/48969474827.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9807/1450/files/best_ab_workout_program.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/9749/8535/files/bugirifirilonukevikefuz.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_off000060d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60D3 5708 bytes
SHA-256: 971cfbaf139d81d2fa97a0bf7af72065d315ac2be70d1d70cdd64941e5181692
font_01_sfnt_off00007436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7436 10032 bytes
SHA-256: 5105f80cf771066a039c46b269168b299c97b73a11587a1d59ef4581804b58e7

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