Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f9edaae4126b738…

MALICIOUS

PDF

47.8 KB Created: 2020-11-01 23:07:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 7f3a42a9946407a620f8be40c02883d4 SHA-1: d5fefa25859209105ff9654333a4a5f140e3e6f3 SHA-256: 7f9edaae4126b73825f96f44935718fda9476c6e097a4622decfe9cb66e3e595
162 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

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.
  • 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/123?keyword=ti+84+emulator+bcs1 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4409813/normal_5f990701bcd00.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369904/normal_5f91f69eb977c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/91003bba-c1ad-4529-b615-73f8f4bae842/bowigamakevarisovowumewuj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/115834f0-8723-4333-8052-7d900a7d4f13/xasetenerepinopinuwiged.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b731dac-03b4-46e0-80c8-adb416157d39/74935403447.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/5092/0855/files/swing_dance_songs_1940s.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0467/5954/2947/files/merge_doc_to_online_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c806604-86af-43b4-85b0-41d6a7b20002/49073251198.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97c1ee27-ddec-4b57-b95c-806f262b0aee/nigowuferagezedukuxokafir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45590ea7-c7d2-4de3-b946-934f2570a4e9/pibimujopo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/8339/1660/files/what_is_free_association_according_to_freud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41dcf239-ce20-4542-b733-eb7dce00f94b/how_to_cancel_friend_request_on_facebook_without_them_knowing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5bbe019-b517-4f9f-96c9-6ef96e35b7ad/omegle_tags_to_find.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25f2dda6-afd1-4979-9745-990bcec1a62c/60061167424.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76cba26d-66ce-4dea-85ea-4f2b126d2259/15217754836.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/5298/5251/files/what_is_manual_testing_and_automation_testing.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/6797/9958/files/93837647349.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6383 5368 bytes
SHA-256: 360ea9faa04abac2814ac22c7ead2764720a9edfe1b75bdb19554e0de74602c5
font_01_sfnt_off000075b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x75B1 11668 bytes
SHA-256: 271d1c6ee3e5d48e561ad917900ec41883f7904857ff63e7f02a6ed1f788acc1
font_02_sfnt_off00009d48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9D48 16088 bytes
SHA-256: a31bcf556e181db077c9b64db679e746f1af4c47e86886feaa6b1c1c5ec82d40

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