Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb3de3766e850ba2…

MALICIOUS

PDF

47.1 KB Created: 2020-11-08 01:58:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 7e27d57eff6cf38f429f7ab190563649 SHA-1: e0971b35114f63b233cb7ee42c7358534e8daa54 SHA-256: fb3de3766e850ba2ecce04443b075c41c74f441b5b24b15adc6bad3f067f6ef7
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded links and text that promote a 'jailbreak ios 4.2.1 ipod 2g' lure. Heuristics indicate these links point to known malicious redirector infrastructure, specifically identifying the URL https://traffmen.ru/123?keyword=jailbreak+ios+4.2.1+ipod+2g as a high-risk indicator. The ML classifier also strongly flagged this PDF as malicious. The document body, though partially obfuscated, contains the same lure and the malicious URL.

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.
  • 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.
  • 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://traffmen.ru/123?keyword=jailbreak+ios+4.2.1+ipod+2g In 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/a47db886-6671-4fa5-83d9-a7b3211da007/perforated_paper_for_w2_forms_staples.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75c70371-33e4-4dd2-9a3e-058f75da77a5/54324217256.pdfIn PDF document text
    • https://fidunonip.files.wordpress.com/2020/11/8625666511.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/84820367450.pdfIn PDF document text
    • https://sufuvuse.files.wordpress.com/2020/11/3074016501.pdfIn PDF document text
    • https://s3.amazonaws.com/tizowodifi/blue_is_the_warmest_color_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98583961-7dde-44c9-bde6-17f84d2c73d6/39165893444.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0e97af0-9a0f-4700-9ed9-fda40c2c7cf3/xalegakekufunofepe.pdfIn PDF document text
    • https://futaxesu.files.wordpress.com/2020/11/65133833438.pdfIn PDF document text
    • https://bojexon.files.wordpress.com/2020/11/fuel_allowance_application_format.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/joxugozurinotisupoxaro.pdfIn PDF document text
    • https://redasiwum.files.wordpress.com/2020/11/poredumevimuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3978f597-07e6-42c9-9191-4068a3cb4ea2/42789160252.pdfIn PDF document text
    • https://s3.amazonaws.com/lixuduwonifa/13344225890.pdfIn PDF document text
    • https://s3.amazonaws.com/purawuma/dobamajigiri.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_off00006cc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6CC6 5624 bytes
SHA-256: 5ea728d2cce9dcf722b9c75084e9aa4a0cd6dde210700fab6c4119d466f804ca
font_01_sfnt_off00008002.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8002 14812 bytes
SHA-256: 32a736c69770d665749818f4d7ea30c874ff9085ce93742995585e7c8fbec55d

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