Malicious PDF — malware analysis report

Static analysis result for SHA-256 91be14ed06fce800…

MALICIOUS

PDF

44.4 KB Created: 2020-11-07 05:23:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 6a9c1f539c03f2c398f8dca498760799 SHA-1: de649655a6fcd4eee244907343d96d31b61eaf39 SHA-256: 91be14ed06fce800a032876a51eceef82c61e09de84cab8c088f7559d5786687
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://cctraff.ru/aws?keyword=hp+envy+700-074+specifications In 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://s3.amazonaws.com/kulinisokakewi/4588584160.pdfIn PDF document text
    • https://s3.amazonaws.com/kitakilesa/aiims_pg_seat_matrix_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35998986-07f3-4ed1-b67b-16c81be275d1/searching_for_summer_answers.pdfIn PDF document text
    • https://xafatukakafu.files.wordpress.com/2020/11/intuos_ctl_480_driver_mac.pdfIn PDF document text
    • https://kedijep.files.wordpress.com/2020/11/xibadujizadewasazozivem.pdfIn PDF document text
    • https://roxofunosum.files.wordpress.com/2020/11/sotiwenuteputaxegosu.pdfIn PDF document text
    • https://verozunevol.files.wordpress.com/2020/11/56961110524.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2db0c559-26d1-4a20-8dbb-2011f55f14e6/ginoda.pdfIn PDF document text
    • https://s3.amazonaws.com/dadupawo/alergia_a_los_aines.pdfIn PDF document text
    • https://jopafez.files.wordpress.com/2020/11/guwesolugixuxogokobetawu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33138211-2e78-436f-a443-4ce00bf47eaf/bamose.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5a3278c-35b1-4e51-9462-efae6ef50620/volume_of_cylinder.pdfIn PDF document text
    • https://mudupetem.files.wordpress.com/2020/11/60700338149.pdfIn PDF document text
    • https://s3.amazonaws.com/vitelitubovuluj/amsterdam_street_map.pdfIn PDF document text
    • https://saridejawe.files.wordpress.com/2020/11/legabujokapabosonam.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_off00005e96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E96 5132 bytes
SHA-256: 0a3d36d99708ce205894ba9f59148854f8ef1cfa25381ebe3a69055fe534f24c
font_01_sfnt_off00007032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7032 11256 bytes
SHA-256: cb98772fa94cf9b22c9411f8bf4690de10319708e75e42a082934eb5cc89995f
font_02_sfnt_off00009684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9684 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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