Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d374016e88643b6…

MALICIOUS

PDF

31.9 KB Created: 2020-11-04 06:00:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: c645acf8b47915db1367cf18ca15b9db SHA-1: c1b9994621afa2738b028b92c94ead2d38df4cf0 SHA-256: 4d374016e88643b67f5ff724838c2dbf67d6638f8c7a551a46b632dcfb9a3475
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF is designed as a lure, presenting itself as a document with a clickable element that redirects to a malicious URL. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_UTM_REDIRECTOR_LINK' strongly indicate that the primary purpose is to redirect the user to a potentially harmful site. The document body contains obfuscated text and embedded URLs, further supporting the malicious intent.

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 31 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://ggtraff.ru/123?keyword=siemens+micromaster+420+manual+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4374685/normal_5f93944291b67.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380213/normal_5f9a2de263926.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390350/normal_5f9647cf5bba0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377391/normal_5f8ee4a004606.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/648cecde-4fd6-43dd-8f01-4efda17a8737/92719553767.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ff3eebf-5ab9-48a4-b9eb-7a6272b40ea8/sexema.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fef3aade-624c-43fa-bc20-ae1a30a52943/27820953169.pdfIn PDF document text
    • https://s3.amazonaws.com/fotojipifuzitul/10596605076.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/baf7efe0-378a-46b0-9360-dd23e561867f/rurixezexidowaxekusejaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/307b9795-a1c3-4ad2-8e26-47c4bc20cfad/19515901064.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8322124-7103-4bfa-b9ac-9b0490ba80fe/mixozufepevusapas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7eda796b-d36b-4378-a6d1-fdf9d250ae82/satimejirejiwosodazodi.pdfIn PDF document text
    • https://s3.amazonaws.com/gofilafixu/97713084311.pdfIn PDF document text
    • https://s3.amazonaws.com/wipotegadodorek/19677062027.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_off00004412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4412 5768 bytes
SHA-256: 2f5b87fff10066de1955e0b00222f571ca895f488911568bb53eb2093796bfdf
font_01_sfnt_off000057a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x57A6 7972 bytes
SHA-256: f8e9bf07335ec9d740d6790d64fa16de2a56fb50d5fe9f4b2bdbaf59e891bd47

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