Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fc68d644195460a…

MALICIOUS

PDF

41.3 KB Created: 2020-10-29 10:39:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: c9444d16f11e6cf39a6e0705a7bb1d01 SHA-1: 29f31e84549351d315ed4ba68df39276fa472c86 SHA-256: 5fc68d644195460a460ae6a640612ee6aa5a1777c3caa8bfb8091fae1e2733f5
162 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a high number of embedded links, many of which point to a redirector service known to host malicious content. The ML classifier also strongly indicated maliciousness. The presence of a download button lure and the embedded URL suggest an attempt to trick the user into clicking through to a malicious site, likely for further exploitation or credential harvesting.

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://ttraff.me/pify?keyword=buckhorn+lake+resort+park In PDF document text
    • https://cdn-cms.f-static.net/uploads/4393180/normal_5f948ff58286d.pdfIn PDF document text
    • https://veborikaja.weebly.com/uploads/1/3/4/3/134317734/2175288.pdfIn PDF document text
    • https://putigazabikikim.weebly.com/uploads/1/3/2/6/132682718/e467f6cd0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zasepo/2007_porsche_cayman_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e74c476a-55a7-4a8f-b85f-688a3654f3a5/17155764359.pdfIn PDF document text
    • https://s3.amazonaws.com/baxadelefofibuz/66965495861.pdfIn PDF document text
    • https://s3.amazonaws.com/pugomonapoxuxe/faxopaxoba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d85d80c6-4c0f-4b1d-a084-b61b3bd0bbbf/penojexatebufiradiladopi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fa08313-c470-4772-95f6-9d80ded05b5e/worizofanaruxuvojej.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/waxenapizusajajagivif.pdfIn PDF document text
    • https://s3.amazonaws.com/bewibiwat/41627815821.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f42d577-00e3-4f9e-a290-76e2fe4d621c/wobaxememav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5004433-3275-4130-81f0-f767717748f6/22933370877.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1cbc91af-b9e0-400a-87a4-837a74717b50/37762554187.pdfIn PDF document text
    • https://s3.amazonaws.com/sazariwapa/csgo_clicker_unblocked.pdfIn PDF document text
    • https://s3.amazonaws.com/gupawupigawono/swiftp_ftp_server_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88cddd1f-f83f-42c9-aed0-d06f50a0a742/casa_amor_exclusive_for_ladies.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000062c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62C7 5136 bytes
SHA-256: feaafde530e63f95e01b99f590647a8e3917184ba3340d10d162e4b536c9ba4b
font_01_sfnt_off00007438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7438 10508 bytes
SHA-256: 98dd42020e7178d7c0ed1b4b644bce4848c335a32f970768e8d3c6b18af38ad6

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