Malicious PDF — malware analysis report

Static analysis result for SHA-256 aec51b15fdd2eb13…

MALICIOUS

PDF

43.2 KB Created: 2020-10-02 11:52:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 62afed067f670afdeb6efc091674c646 SHA-1: 2c888400a23e95ce6dfe39a9b8950709b54da33d SHA-256: aec51b15fdd2eb132324a4f56a5d27d829ee99174dd2b1cfbf1255f63bf664ad
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/pify?keyword=heat+curve+worksheet In PDF document text
    • http://files.ldeleon.net/uploads/1/3/0/7/130740264/lator.pdfIn PDF document text
    • http://gejutajem.afuricupertino.com/uploads/1/3/1/6/131606636/b6230.pdfIn PDF document text
    • http://files.wisefirstgrade.com/uploads/1/3/1/3/131381679/durovinikegeje.pdfIn PDF document text
    • http://bevojuda.discoveryexpresskids.com/uploads/1/3/1/8/131856435/rudozago.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/e7a2fa26-b807-4579-9232-debd7c8c3e93/bokiraxalexi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84266e08-345e-4588-a85a-0bb1717633de/54721109698.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b61a1cb0-34b6-44f3-806a-b239fabcce15/99528389398.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44887338-0324-461d-b894-06b923a16ac6/78438574826.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8951/6958/files/badisiwaji.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/2821/8019/files/where_im_calling_from_new_and_selected_stories.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0467/7599/2473/files/freelance_writer_resume_description.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/1617/8842/files/kulosepisejuwib.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1097/2056/files/71882680577.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/2279/7976/files/albuquerque_comic_con.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/6746/8704/files/fiwapi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8774/9529/files/vewawovabomebupozo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F4E 4760 bytes
SHA-256: 8089cd05d85814cdc4a7beb500e46dbf6c842c342ba1c9e82afa909f9c695264
font_01_sfnt_off00006f9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F9B 10032 bytes
SHA-256: efac154f612d39b1440961a1d0da05f290ddd47e590b365d88fb10c3720f45a5
font_02_sfnt_off000091ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x91EC 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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