Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc835fec8d574671…

MALICIOUS

PDF

44.7 KB Created: 2020-11-05 10:46:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: aa4ed391a499befbe86fbbdade7681ad SHA-1: d3511d489f31951b7062f6c61c724f77c730cee8 SHA-256: fc835fec8d574671bf48f5e30f94cd8a2b3a1c337ae21860abc7cd370be9e144
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.me/123?keyword=american+customs+broker+association In PDF document text
    • https://cdn-cms.f-static.net/uploads/4403565/normal_5f96875aa3613.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387244/normal_5f8e7e5419dcd.pdfIn PDF document text
    • https://xuzelakojit.weebly.com/uploads/1/3/4/5/134593048/0798a29dfc867.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://uploads.strikinglycdn.com/files/93dc4f6e-0db6-4303-a35c-378deaa90588/fozapezagolovix.pdfIn PDF document text
    • https://s3.amazonaws.com/jonora/chase_mobile_app_apk_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8104427-eef0-43bb-9db2-610b559ab0e6/vupopup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53e8f603-4a86-4c1b-a447-3b16164b5a2f/komobizajabumigetatak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b55c9cd9-a9f9-4fe8-bae9-efc3c63825a9/37157769831.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/ketavezajafuvuxorufukat.pdfIn PDF document text
    • https://s3.amazonaws.com/tamobalasu/unblocked_games_3000.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a7e681a-fbc5-409a-a4e4-3893936383c8/10563092127.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0017b790-023f-4927-be89-cb4c7f123aa2/wewevokusuruzedeperejemix.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004c74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4C74 4988 bytes
SHA-256: a5c0d39768f725fe13311f18c19a69208e6f5d0b51f788811f318e38054c9f94
font_01_sfnt_off00005d45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D45 11288 bytes
SHA-256: 169d8ea2ad4f24d16450abee86bfbeb1d554b04548b3c9e2f2242e00ef8129ed
font_02_sfnt_off0000827e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x827E 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501
font_03_sfnt_off000097ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x97AC 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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