Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a348fcd58d30464…

MALICIOUS

PDF

49.9 KB Created: 2020-11-02 04:52:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: d4b08280e7960149aad01aed64bfd81e SHA-1: b817ca15fd24b0f22910f093ed287b08d07efa79 SHA-256: 2a348fcd58d30464805e2324f1e0bbb4d552356d90e9d0c32409e2bbddf1d39a
162 Risk Score

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://cctraff.ru/pify?keyword=midi+drum+patterns+free+download In PDF document text
    • https://cdn-cms.f-static.net/uploads/4375210/normal_5f8dfe617acd5.pdfIn PDF document text
    • https://kawuloxegulul.weebly.com/uploads/1/3/4/3/134389306/1894118.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387814/normal_5f91d2657fdce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407060/normal_5f96eb3705daf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383131/normal_5f92b73125e7c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388156/normal_5f97a25d2f7f3.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/resixexi/lewowon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f25991f5-745b-421c-841e-522f63e0c755/poxekifemazifoba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9227b8eb-441b-4c26-b286-f14c24bd334c/91597275210.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_off000080bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x80BC 5284 bytes
SHA-256: e9ab985876f1b8671a7b21a9c2dc33eabef68b4b342b540d635849c360f859a0
font_01_sfnt_off000092b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x92B8 11884 bytes
SHA-256: 6f625ddc53a76e6c569174d99b32b79ba8ef66dceb898e9945ea278da00f4e15