Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c842c758119b121…

MALICIOUS

PDF

44.6 KB Created: 2020-07-16 03:47:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3f6b35c94fb53a8ad1c767e1b4d6431a SHA-1: 4dab5d9a243277c2c5654224ef4234ab52fec110 SHA-256: 6c842c758119b121ab135cc2b8e8b26ff7c181fe8d005fcc05945c1bcf4a60cc
154 Risk Score

Malware Insights

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

The PDF file contains embedded links that redirect to a link farm, masquerading as a resource for Excel formulas. The ML classifier strongly indicated maliciousness, and the PDF is configured to redirect users to potentially harmful external sites. No scripts were extracted, but the primary attack vector appears to be social engineering via deceptive content and malicious redirection.

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=excel%20formula%20sum%20across%20multiple%20worksheets
    • http://files.wanderwithsari.com/uploads/1/3/2/3/132302926/nipab_nurojojeliz_lexafofebomet_bonuxi.pdf
    • http://files.firewiseconsultants.com/uploads/1/3/1/6/131606395/7623767.pdf
    • http://files.ddayhistorian.com/uploads/1/3/0/7/130775196/a9ddb07e12b89.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://mivokalu.files.wordpress.com/2020/06/kosoretumevitowini.pdf
    • https://kekebig.files.wordpress.com/2020/06/giwukeruwomijutilep.pdf
    • https://giwivusimodo626075209.files.wordpress.com/2020/06/gatovevejivoxujojox.pdf
    • https://pitimonuzoxa.files.wordpress.com/2020/06/dujitagasevujawijipitajaf.pdf
    • https://tenafixufuvo.files.wordpress.com/2020/07/doxezowe.pdf
    • https://detorodek.files.wordpress.com/2020/06/kedogutibotovu.pdf
    • https://boxisev.files.wordpress.com/2020/06/rolukikokilanogavuboxefuw.pdf
    • https://cdn.shopify.com/s/files/1/0432/5041/7827/files/gideripeloduze.pdf
    • https://cdn.shopify.com/s/files/1/0428/3655/7987/files/levumowiduxuvofurevar.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/garul.pdf
    • https://cdn.shopify.com/s/files/1/0432/4959/8632/files/xanetoxabelovis.pdf
    • https://cdn.shopify.com/s/files/1/0429/9853/0201/files/kukenemenabal.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/24375498268.pdf
    • https://cdn.shopify.com/s/files/1/0431/4975/4519/files/pinipenaxumojuvometovado.pdf
    • https://cdn.shopify.com/s/files/1/0432/3796/5979/files/kifawati.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_off00006f19.bin
d42743cade0de1645eb5cbc1b282098e2bf758925d0c9fe5303c543621d36e4a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F19 5212 bytes
font_01_sfnt_off000080e4.bin
8dfd86c8880c2ebda8ca701b26da4fcaadcbf2d0b8a1086b72d990ac25000412		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80E4 10560 bytes

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