Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf7647d7c5e51c0d…

MALICIOUS

PDF

38.2 KB Created: 2020-10-25 23:16:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: a9f4c1554ad3afe0d08e281a3ae5b2a5 SHA-1: 1eb2d44e970449528ff45e6772e836d7e6fda73f SHA-256: cf7647d7c5e51c0d4f6dcb2037cf5609dc41d146e6b817911ae42cb10115d4ef
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a known malicious infrastructure, indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains a URL that appears to be part of a link farm designed to attract traffic. The ML classifier also strongly flagged this PDF as malicious. The presence of embedded URLs and the redirector link suggest an attempt to lead the user to a malicious site, likely for further exploitation or phishing.

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/123?keyword=feiyu+vlog+pocket+manual In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366980/normal_5f88717ce9725.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391636/normal_5f8f3ceb6ee0f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367289/normal_5f8841f2a8874.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366952/normal_5f8f8b09b9d57.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366057/normal_5f8727f99575d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368238/normal_5f8ffa01d3a52.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404503/normal_5f945cf1b5bfc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387821/normal_5f922dc6dbcd4.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/gupuso/35740738970.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/xuzamitirelozofudi.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/albert_camus_la_peste_download.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/87598968432.pdfIn PDF document text
    • https://s3.amazonaws.com/jenisozazewubo/18316154051.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/6694/5447/files/1508570576.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4953/3088/files/sleeping_beauty_anne_rice_beautys_punishment.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/8432/8344/files/cushman_trackster_value.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/5890/3223/files/imagemagick_to_tiff.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0487/0553/6150/files/54021928017.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/8460/2262/files/zafolijulos.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1960/7962/files/74816033857.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/2846/1206/files/backtrack_5_linux_installer_apk_download.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_off000056b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x56B7 5160 bytes
SHA-256: 86870cb198ced22e1d37b256e6ef88e92c2f86ae7df836cfffd63f0b7432ba1f
font_01_sfnt_off0000684e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x684E 10440 bytes
SHA-256: c512a75c637aeec43c05efc67ffb8c6915e9553d009bb1ee6364679d9b1aefc2

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