Malicious PDF — malware analysis report

Static analysis result for SHA-256 114b5d26f1e700ff…

MALICIOUS

PDF

30.7 KB Created: 2020-11-02 06:48:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: c226829239253e4b98553ca837b34ee5 SHA-1: 369170b9c4004aaf7bd316ee1c4b8b707fdc1ce4 SHA-256: 114b5d26f1e700fff453bdb7375ee8778bb6b65828a79c3d01740d01fa6ba519
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to benign-looking PDF files, but one critical link directs to known malicious redirector infrastructure. The document body and embedded links suggest a lure to a link farm, likely to obfuscate the ultimate destination or to generate traffic for SEO manipulation. The ML classifier strongly indicated maliciousness, supporting the presence of malicious links.

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://ggtraff.ru/aws?keyword=best+torrent+client+2020+reddit In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wefadep/xivom.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/3938/2430/files/75130182084.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/62756425995.pdfIn PDF document text
    • https://s3.amazonaws.com/vuraradaso/92980477449.pdfIn PDF document text
    • https://s3.amazonaws.com/gofiguj/40077130201.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5795/5494/files/idylis_air_filter_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2937/2832/files/vesusuranojofobezu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/1348/6743/files/42401226236.pdfIn PDF document text
    • https://s3.amazonaws.com/ganubatebedoxez/duwedapexewilosuruneg.pdfIn PDF document text
    • https://s3.amazonaws.com/wixamupelinere/dibisemozebazut.pdfIn PDF document text
    • https://s3.amazonaws.com/mibiwivanetuj/the_attributes_of_god_tozer.pdfIn PDF document text
    • https://s3.amazonaws.com/gomakobez/miguel_street_analysis.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_off00003f07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3F07 5044 bytes
SHA-256: c87d332f85a374162350b79a0d99414c9906348f08c4fa040751ee4d116285e4
font_01_sfnt_off00005043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5043 8764 bytes
SHA-256: c76265ebc791e8c84cbc7f8e39829d211970bccb8e496b6d0d6450e90a6f9c91

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