Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cd6ff1a37b5e726…

MALICIOUS

PDF

55.7 KB Created: 2020-10-07 11:05:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 3c03357e3ef6aeeeb60fe026a958250e SHA-1: bc7bd19ac01f40981314695692076395a39878f9 SHA-256: 8cd6ff1a37b5e726574154db29a623856090ad8eab2a6bf5412173f1fafd0f44
202 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ggtraff.ru/strik?keyword=pathoma+2017+download In PDF document text
    • http://monukepu.holtzeducationalcenter.org/uploads/1/3/1/4/131453194/7708900.pdfIn PDF document text
    • http://files.stephaneheaume.com/uploads/1/3/1/3/131378921/8691c5e814d.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/1/0436/4537/0528/files/ropifowojujibiwil.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9932/4567/files/mystic_grimoire_of_mighty_spells_and_rituals_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0465/1194/7926/files/zenonia_5_berserker_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8315196f-75fb-45d9-8a61-4f235f341008/posajufujenitipefugan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d59557e4-ea43-408b-bf24-0f79723c1ac5/30279057821.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29da5db2-4bd5-4455-a20a-53c4ec392da3/jixekidelifasa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/1873/4746/files/95316725216.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/7622/2621/files/4178478649.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/2664/7709/files/recetas_del_ayuno_de_daniel.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0000ac2c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xAC2C 20624 bytes
SHA-256: fb6eb340cf0538b1f06868a42e29cba033bd11035a00f1c6b21238ac828a8016
font_00_sfnt_off000063a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63A1 5292 bytes
SHA-256: 7c10703c75e01bb4a2d6c9ac8cd5d65c65ce0e2f4487a1216a8d7d4194bee1aa
font_01_sfnt_off00007593.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7593 1800 bytes
SHA-256: a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
font_02_sfnt_off00007e20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E20 14744 bytes
SHA-256: 7a91fab5602283a5d813a53fcc6c6b13c82e88f69518962d70274bd0c4b307df

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