Malicious PDF — malware analysis report

Static analysis result for SHA-256 b59ca5ec791f0007…

MALICIOUS

PDF

51.8 KB Created: 2020-10-31 10:46:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 39832ecb71110bef36f8a815d81901aa SHA-1: 10f285a51ac5b44be7c15aed3ee649dcec7aecff SHA-256: b59ca5ec791f000788db19262b42931a433077f1b98f351603f55388d0efa256
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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.club/pify?keyword=driving+age+restrictions+in+texas In PDF document text
    • https://nijubalalo.weebly.com/uploads/1/3/1/4/131453980/latavupefiso-xumexeromawaniw.pdfIn PDF document text
    • https://kokexofagisukop.weebly.com/uploads/1/3/2/7/132710589/3067758.pdfIn PDF document text
    • https://nobozufale.weebly.com/uploads/1/3/4/3/134322784/8942329.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/8984b31a-a229-467f-8fa7-d43eb2cc3ca1/32082898275.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09b2e016-a482-41e8-8dbb-2399f5644b05/24961509785.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/chinese_food_menu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91e0f650-2cfb-433d-92f8-e5285a089cfc/91976642833.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a4acfe3-1b0f-478e-99a1-2799e326390c/19277927385.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8927b3ab-2638-4db1-ab0a-42668febde5c/sofavut.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/1348/6743/files/zevaxodedikamo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/5865/4105/files/pixajopuvitu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2506/2298/files/ebook_download_site.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/35351846748.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2358/7733/files/best_calendar_widget_app_for_android.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0492/3690/2044/files/download_game_undead_slayer_extreme_mod_apk.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_off00007447.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7447 5060 bytes
SHA-256: fdf24f6ab4b062ebd8a4c5763dffc65ed8bf55cb4db4a7cf3099348e0e62398f
font_01_sfnt_off000085a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x85A5 11224 bytes
SHA-256: ca4a69c6a82f71ecc7f3ecec88105e8529b4e2233ee9348a3c11c886925e6b4f
font_02_sfnt_off0000abd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xABD8 16272 bytes
SHA-256: 6ef70b60f60e75b3e19c513aeb7a39c6207ceb76fda3b9c5815830851e055dec

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