Malicious PDF — malware analysis report

Static analysis result for SHA-256 a77cebb8a4631f78…

MALICIOUS

PDF

45.0 KB Created: 2020-10-28 02:39:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-02-20
MD5: d4a7918ca9533c0193ec5844d70c07ad SHA-1: b6ea97abbe47d3e55403ada53a060883af16a919 SHA-256: a77cebb8a4631f78351555389ca4984a1a47b32c0da605180a30bcf4c162bc17
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=pineapple+pound+cake In PDF document text
    • https://fulipevaxavu.weebly.com/uploads/1/3/2/6/132695351/napofujewub.pdfIn PDF document text
    • https://pagofere.weebly.com/uploads/1/3/1/3/131398194/544a29bb0a04e.pdfIn PDF document text
    • https://jiwadurator.weebly.com/uploads/1/3/0/7/130776405/eceae5.pdfIn PDF document text
    • https://zadumeredevasax.weebly.com/uploads/1/3/1/4/131453870/411cd83.pdfIn PDF document text
    • https://penulikadima.weebly.com/uploads/1/3/1/4/131482887/364074.pdfIn PDF document text
    • https://moxitasa.weebly.com/uploads/1/3/1/4/131454719/kesarimota.pdfIn PDF document text
    • https://dabagurujor.weebly.com/uploads/1/3/4/3/134350609/5cd7aa960.pdfIn PDF document text
    • https://buliduxefexefux.weebly.com/uploads/1/3/1/6/131636978/d8771846ed27a.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/1/0501/2887/9809/files/tawogapanubanilapezape.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0492/8074/5629/files/hanger_2_unblocked_games_vevo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5153/9866/files/tuff_torq_k46_rebuild.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/4156/6105/files/dahon_speed_uno_bike.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/3830/0568/files/notafunesegozekafe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/2557/8159/files/99505276816.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/2030/3006/files/get_real_followers_for_instagram_by_hashtags_apk_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/269ea1f2-8151-438e-b3a1-419284ad603f/dataxavu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d21e9d1-bed1-4192-b03a-18e12c8c721c/muminurisewazasememikisat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8db0d247-fecb-484e-af4a-acaebac723d9/87934690174.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_off00006ff7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6FF7 4860 bytes
SHA-256: cf7018b2fa3ee4daa0cb7a98cb487c89897ea2671145f2766c0b92166bddf1d1
font_01_sfnt_off00008085.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8085 11240 bytes
SHA-256: c648e7c9d5e7d41be83a647093cbd25bc0ef81b7092b194c25aef3449d013bad

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