Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9dc968bc1d0ab94…

MALICIOUS

PDF

42.0 KB Created: 2020-09-17 14:15:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eb70e926213fdf9dcb9cb8e1de648599 SHA-1: f9951d170ac1abf8aea1db8416fb214e606cc356 SHA-256: b9dc968bc1d0ab94f904edf5bb67e395018662a8c40a5d4eefc548e110e120ba
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, many of which point to known malicious redirectors or suspicious domains. The document body, though heavily obfuscated, contains a URL that appears to be a lure for 'last horizon unblocked at school'. This suggests the document is designed to trick users into visiting malicious sites, likely for credential harvesting or malware delivery. No scripts were extracted, limiting the analysis of direct execution capabilities.

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://ttraff.club/wix?keyword=last+horizon+unblocked+at+school
    • http://files.jvonhdesigns.com/uploads/1/3/0/7/130740586/e7c41.pdf
    • http://files.makerteacher.net/uploads/1/3/0/8/130873828/0a0540bfab07a7.pdf
    • http://vuzokad.wildthingzdogmushing.com/uploads/1/3/0/8/130813528/5e6e4399.pdf
    • https://77e23c70-ff9a-4516-8f58-4b3275457dd3.filesusr.com/ugd/d38238_cd7d27d742f14752b310d9887a3000a4.pdf?index=true
    • https://ff36c79f-008f-43d6-84ec-6678d56a84c3.filesusr.com/ugd/b85eb0_e955ee4737cc49b0b86589cd3abd7697.pdf?index=true
    • https://4d52ffc9-f29a-492b-8c4f-54bcca9b141d.filesusr.com/ugd/bb13a2_ac29dc5c5f364772893448b49fd7528d.pdf?index=true
    • https://ae056d70-8411-41c7-8cad-8ff2f16913a5.filesusr.com/ugd/17beed_502e367b08e5485d8695f60ab6b967a8.pdf?index=true
    • https://e2a8612b-4659-49d8-97da-e0215cca34d3.filesusr.com/ugd/cb0188_160a4368f33345df8539879699666e50.pdf?index=true
    • https://92395b3c-16ed-4215-ad1f-ddfd79d2406d.filesusr.com/ugd/90c678_d32906fbfb5f44c2bc58b0be7a19e020.pdf?index=true
    • https://339eebd7-338e-45bc-959d-052d568d360b.filesusr.com/ugd/234f58_ce71709026cd4b038d4e518cd58e90fd.pdf?index=true
    • https://a817c092-1586-4ace-8dc3-5cbf09d85e94.filesusr.com/ugd/221eaa_245134623a314fa88ea0db86a79df333.pdf?index=true
    • https://090a5d4d-39dc-49f8-8680-cd3caf54e8b4.filesusr.com/ugd/d1c05f_761e114b2bcc4098a7a8d587f3ff9e0b.pdf?index=true
    • https://f7b5c845-a185-43fb-9bbf-259ec816f190.filesusr.com/ugd/1cc777_408a0176bf9446f98d34feccbdf6f9c4.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0461/0903/2612/files/rakuropabaduxaruz.pdf
    • https://cdn.shopify.com/s/files/1/0431/6112/5015/files/68572470625.pdf
    • https://cdn.shopify.com/s/files/1/0436/4029/1486/files/28470274454.pdf
    • https://cdn.shopify.com/s/files/1/0431/0741/8273/files/zelutukiperevepaje.pdf
    • https://cdn.shopify.com/s/files/1/0431/6912/0413/files/pegijizowitetuwabusumuz.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000065cd.bin
d57249ab7e1fc48c58896dbf137902b0e573dec8e6cd0b41601de17d5983a1ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65CD 5224 bytes
font_01_sfnt_off0000778f.bin
36b73c13fee6e26dedf3fd792f59c42f0fa84f52b92990f61473a757a2defdc3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x778F 10344 bytes

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