Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e3e1262ea61ea17…

MALICIOUS

PDF

66.4 KB Created: 2020-08-09 03:03:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d1032c8cbf927ed75f17aa7bb3df2905 SHA-1: 38dd90667ce6eb9a70653ac348165ba0ed00ddf9 SHA-256: 0e3e1262ea61ea17aee70acf6852b5cca81adcf3af6f30a01ae5e01e8f18db76
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external PDFs, a technique often used in SEO link farms. One of the primary links, 'https://ttraff.ru/pify?keyword=definicion+de+calidad+segun+varios+autores+pdf', is flagged as a malicious redirector. The document body, though heavily obfuscated, contains text related to quality definitions and the wkhtmltopdf application, suggesting a lure to disguise the malicious intent. The presence of many external links and a malicious redirector indicates a likely attempt to drive traffic to malicious infrastructure.

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.ru/pify?keyword=definicion+de+calidad+segun+varios+autores+pdf
    • http://files.horriganarchitect.com/uploads/1/3/1/6/131637919/2236094.pdf
    • http://files.rmstoof.com/uploads/1/3/1/3/131384468/98e4c5e8c5743.pdf
    • http://files.bizsign.shop/uploads/1/3/0/7/130775837/f08441725.pdf
    • http://files.mrksrecyclehawaii.com/uploads/1/3/1/3/131383333/tidax_bapuzali_jumavilonu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/8052/4710/files/ruwuvevup.pdf
    • https://cdn.shopify.com/s/files/1/0434/2166/3397/files/sisofudigipimifasugisado.pdf
    • https://cdn.shopify.com/s/files/1/0431/8553/7175/files/fikibawopedasixuvokumuraw.pdf
    • https://cdn.shopify.com/s/files/1/0437/9151/5797/files/18664692640.pdf
    • https://cdn.shopify.com/s/files/1/0437/7500/0730/files/brown_eyed_girl_guitar_chords.pdf
    • https://cdn.shopify.com/s/files/1/0434/3303/3880/files/95793899001.pdf
    • https://cdn.shopify.com/s/files/1/0432/1440/5793/files/10193752814.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/4155504299.pdf
    • https://cdn.shopify.com/s/files/1/0428/8331/7926/files/82389550041.pdf
    • https://cdn.shopify.com/s/files/1/0431/9127/1586/files/kopirusalarenanajo.pdf
    • https://cdn.shopify.com/s/files/1/0433/8014/6339/files/dakokesomojepunor.pdf
    • https://cdn.shopify.com/s/files/1/0436/2534/9273/files/komodaloxafitum.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_off0000c428.bin
1c2696f04a8ad62ed23ad0a23b081379889aca63e391ac9c4e1876c4c70b536a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC428 5384 bytes
font_01_sfnt_off0000d699.bin
9bd343675970fe6c4856ac524a18dc686dde79f67f81f7ff3b9bd19e83cf350b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD699 10868 bytes

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