Malicious PDF — malware analysis report

Static analysis result for SHA-256 53cfce4db43c7223…

MALICIOUS

PDF

41.6 KB Created: 2020-10-24 21:25:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 856994958e6e7e8f9610fcbb2ef47896 SHA-1: 7c9df6cfa3e954358c0fbb2757a3b3131fc5cbe5 SHA-256: 53cfce4db43c7223551a890060cc061ae4c9240a148126ebe46146d5d2084367
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a link disguised as a file converter, which is a common social engineering tactic to trick users into clicking malicious URLs. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms that the primary URL leads to known malicious infrastructure. The ML classifier also strongly indicates maliciousness. No scripts were extracted, but the presence of a malicious redirector and the social engineering lure suggest an attempt to deliver a second-stage payload.

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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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=excel+to+pdf+i+love+pdf+converter
    • https://cdn-cms.f-static.net/uploads/4366017/normal_5f8b59237b36b.pdf
    • https://cdn-cms.f-static.net/uploads/4365580/normal_5f88a0a4c9cbe.pdf
    • https://cdn-cms.f-static.net/uploads/4368984/normal_5f88ac398f1b6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0439/2094/9403/files/2857655786.pdf
    • https://cdn.shopify.com/s/files/1/0498/5772/4578/files/natafapopin.pdf
    • https://cdn.shopify.com/s/files/1/0491/7094/0070/files/zedge_wallpaper_mod_apk.pdf
    • https://cdn.shopify.com/s/files/1/0434/0314/9479/files/chrome_download_failed_network_error.pdf
    • https://cdn.shopify.com/s/files/1/0440/2960/8101/files/48391425053.pdf
    • https://uploads.strikinglycdn.com/files/fd48dd4c-659b-4e99-b703-48945d805b36/kaduvibujupunipano.pdf
    • https://uploads.strikinglycdn.com/files/4f13c9ea-65a9-45ff-9d2e-161d670bd359/39582245765.pdf
    • https://uploads.strikinglycdn.com/files/9785f1e5-b5d1-4861-9876-498df09ba3e5/scrotal_edema_icd_10.pdf
    • https://uploads.strikinglycdn.com/files/195fbd56-f15b-430e-8788-ff96dbe9e171/fomejirapebodesofi.pdf
    • https://uploads.strikinglycdn.com/files/cf452772-bcfb-46b1-97dc-ff278d3d1b40/52979903797.pdf
    • https://cdn.shopify.com/s/files/1/0432/5025/3992/files/hard_drive_capacity_meaning.pdf
    • https://cdn.shopify.com/s/files/1/0502/5369/3119/files/telecharger_whatsapp_dhabi_apk.pdf
    • https://cdn.shopify.com/s/files/1/0499/0346/8735/files/dsssb_nursing_exam_general_instructions.pdf
    • https://cdn.shopify.com/s/files/1/0266/9484/4587/files/90786859725.pdf
    • https://uploads.strikinglycdn.com/files/b789a3d8-fdda-406d-bf3f-d230f1aa52af/jijeredekif.pdf
    • https://uploads.strikinglycdn.com/files/643bdba3-20af-4111-b845-e9a566c1b24f/juvanagoroja.pdf
    • https://uploads.strikinglycdn.com/files/c4152ef9-ba49-4086-b7a2-5b00c554556b/wabanofonumafofudixobugid.pdf
    • https://uploads.strikinglycdn.com/files/96fdaa86-176b-440e-b330-c30724aabcda/volukozalavos.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006734.bin
113930ef5893701b7637360b0ab618432601417308b4319c75c63bbf6ad87a72		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6734 4848 bytes
font_01_sfnt_off000077d3.bin
28bbcd029acc5aa6be0d749d0620f7f7e1061e274847db63c4a7351d7c68f344		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77D3 9792 bytes

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