Malicious PDF — malware analysis report

Static analysis result for SHA-256 de926450b07ce1fa…

MALICIOUS

PDF

37.3 KB Created: 2020-08-12 17:25:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f4d405177510f5086d32b6965709bc70 SHA-1: ce9823f71261716151d9e431595801f10056641d SHA-256: de926450b07ce1fab8b2da6523aed98cafbc8f10c443375a0945c6507430e5a9
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to domains associated with SEO spam and redirector infrastructure. The primary malicious URL identified is https://ttraff.com/wb?keyword=vampire%20academy%20pdf%20google%20drive%20in%20english, which is flagged as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting the document's purpose is to drive traffic to malicious sites.

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.com/wb?keyword=vampire%20academy%20pdf%20google%20drive%20in%20english
    • http://lenexed.pcfireworksplus.com/uploads/1/3/1/3/131379246/ad8d35.pdf
    • http://files.myhighlandcreek.org/uploads/1/3/0/7/130776439/41b7f080880c3.pdf
    • http://files.ashworthband.com/uploads/1/3/0/7/130739183/kemazejipejawazi.pdf
    • http://files.bossbabemarketing.net/uploads/1/3/1/4/131437669/0e854f8de0a29.pdf
    • http://files.gorhamperformance.com/uploads/1/3/0/8/130813913/86858.pdf
    • https://cdn.shopify.com/s/files/1/0433/1657/6424/files/zasorerugibi.pdf
    • https://cdn.shopify.com/s/files/1/0431/5280/1954/files/76388315600.pdf
    • https://cdn.shopify.com/s/files/1/0437/4790/1592/files/sowefanipevafawabipa.pdf
    • https://cdn.shopify.com/s/files/1/0437/7093/7498/files/nukasimobaf.pdf
    • https://cdn.shopify.com/s/files/1/0432/2715/2539/files/pusanimubevopidosova.pdf
    • https://cdn.shopify.com/s/files/1/0430/9532/6887/files/astable_multivibrator_project_report.pdf
    • https://cdn.shopify.com/s/files/1/0433/6100/9829/files/958362132.pdf
    • https://cdn.shopify.com/s/files/1/0433/9073/0398/files/zozab.pdf
    • https://cdn.shopify.com/s/files/1/0435/5165/4047/files/bodomopus.pdf
    • https://cdn.shopify.com/s/files/1/0437/4780/3287/files/mitosis_and_cell_cycle_quiz.pdf
    • https://cdn.shopify.com/s/files/1/0437/6192/6293/files/how_to_add_people_to_discord_call.pdf
    • https://cdn.shopify.com/s/files/1/0436/7394/4217/files/alter_ego_1_descargar.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_off00005211.bin
e87f82d58efc97fc9dcaaeb19d7ec54ea630fe1e4a17f05ffa1016fac53258be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5211 5696 bytes
font_01_sfnt_off0000655a.bin
e67ba50983fa7a7ac29e071c715c77d46ad4dbc8726c534d3cfc9d7563a2ec75		 pdf-font-stream PDF embedded font (sfnt) at offset 0x655A 10180 bytes

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