Malicious PDF — malware analysis report

Static analysis result for SHA-256 19b78ed52bd02541…

MALICIOUS

PDF

41.8 KB Created: 2020-08-25 02:53:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d24a6fb6d68c2e7022918a70f1e677cc SHA-1: 6922d8c2bd7dc8689884c3a3119320c3630a59b2 SHA-256: 19b78ed52bd02541d896f87b1ff652d45c4f19c5828d6e29a9133b1181916eb3
194 Risk Score

Malware Insights

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

The PDF contains numerous links, with one pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to downloading an archive and a password, suggesting a lure for a password-protected archive. This aligns with the 'SE_PASSWORD_ARCHIVE_LURE' heuristic, indicating an attempt to trick the user into downloading and decrypting a malicious 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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/pify?keyword=avenged+sevenfold+nightmare+album++rar
    • http://files.iancarlsen.com/uploads/1/3/0/7/130775221/780859.pdf
    • http://files.scsaints.com/uploads/1/3/1/4/131437649/8916663.pdf
    • http://timomuzal.sustainablemaize.com/uploads/1/3/1/4/131407005/sejukutunutigu-ragadoxa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/3309/1480/files/20431012212.pdf
    • https://cdn.shopify.com/s/files/1/0429/1058/0903/files/ipg_carmaker_manual.pdf
    • https://cdn.shopify.com/s/files/1/0437/3400/7973/files/899302147.pdf
    • https://cdn.shopify.com/s/files/1/0437/1460/9305/files/sabitekuganigam.pdf
    • https://cdn.shopify.com/s/files/1/0429/6838/3642/files/53097483073.pdf
    • https://cdn.shopify.com/s/files/1/0434/6462/2246/files/80943240080.pdf
    • https://cdn.shopify.com/s/files/1/0445/6900/2143/files/sql_database_design_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0431/6761/3082/files/25263631550.pdf
    • https://cdn.shopify.com/s/files/1/0434/7704/1304/files/livros_sobre_apicultura.pdf
    • https://cdn.shopify.com/s/files/1/0437/7886/7351/files/nomanotogomujepi.pdf
    • https://cdn.shopify.com/s/files/1/0431/8766/7103/files/dunabizix.pdf
    • https://cdn.shopify.com/s/files/1/0438/3798/0834/files/vuxevu.pdf
    • https://cdn.shopify.com/s/files/1/0431/8072/0285/files/rebokulemiruwejaz.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_off000062d5.bin
dbe9a5eefb1e478f610d040367c2aa9c391e0bf4840f3a02c9e13c295a70d01a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62D5 5508 bytes
font_01_sfnt_off0000756d.bin
5401676768f935fbc14ee3d3774c3202175e65f98e86d4a7926fd8fca67fb890		 pdf-font-stream PDF embedded font (sfnt) at offset 0x756D 10688 bytes

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