Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a25ca42c160638c…

MALICIOUS

PDF

62.1 KB Created: 2020-10-05 11:46:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 7f9aa74efb146382cfa789ee5ad1f46a SHA-1: ef075cd47b455a52c089f0f2f571e0588397b437 SHA-256: 8a25ca42c160638c0231ea62d19d5d7f710a048cafe2d4b97a9ee6ae0926caf0
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/strik?keyword=wilder+penfield+books+pdf In PDF document text
    • http://pefeligi.villalaurus-enluberon.net/uploads/1/3/1/4/131482826/3648705.pdfIn PDF document text
    • http://wirorabom.kayleighfichten.com/uploads/1/3/1/4/131438562/museterubukijex.pdfIn PDF document text
    • http://files.elucook.com/uploads/1/3/1/8/131858530/2316946.pdfIn PDF document text
    • http://gadepixup.derekamartin.net/uploads/1/3/0/7/130776394/889a70cb01d293c.pdfIn PDF document text
    • http://zuzotej.acereelstudio.com/uploads/1/3/0/7/130740368/f331b97c742.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://cdn.shopify.com/s/files/1/0436/2171/2034/files/work_out_bets_for_couples.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3359/0940/files/28225689624.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/9984/3485/files/atmospheric_pollution_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/822f90cf-5dd1-43ee-a637-3cf7c83db532/30409066120.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfdf5ae7-86df-40bb-a3ca-3071eeace41b/wiposorixepotaguxemawosig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0083b831-1859-47db-9881-c1bd0c45087c/xazowosapono.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ab4a0bf-e6e8-4ef2-9706-074c19ca001a/peluganuvakufuxixezunafe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b9f4960-78bc-4f21-b701-df402823fb68/45425803101.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f920547b-83e8-464f-b237-ad0b9cbda59d/97892211808.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_off0000a83d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA83D 4748 bytes
SHA-256: cf3d5570162110acb61975d319b97ddc2ba432c000215f9d5759c7477316b3de
font_01_sfnt_off0000b862.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB862 11288 bytes
SHA-256: e809cb86516d4d047ebdf86fecf050b8d13bf39765f5ac5d99b9f0447dd823da
font_02_sfnt_off0000dd46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD46 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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