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) First seen: 2020-09-24
MD5: 3f6b35c94fb53a8ad1c767e1b4d6431a SHA-1: 4dab5d9a243277c2c5654224ef4234ab52fec110 SHA-256: 6c842c758119b121ab135cc2b8e8b26ff7c181fe8d005fcc05945c1bcf4a60cc
194 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating it is a malicious redirector, specifically designed to lure users to external sites. The embedded URL and the document body text, though heavily obfuscated, suggest a pretext related to Excel formulas. The primary redirector URL is identified as malicious infrastructure, likely serving as a lure for phishing or malware distribution.

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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 In PDF document text
    • http://files.wanderwithsari.com/uploads/1/3/2/3/132302926/nipab_nurojojeliz_lexafofebomet_bonuxi.pdfIn PDF document text
    • http://files.firewiseconsultants.com/uploads/1/3/1/6/131606395/7623767.pdfIn PDF document text
    • http://files.ddayhistorian.com/uploads/1/3/0/7/130775196/a9ddb07e12b89.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://mivokalu.files.wordpress.com/2020/06/kosoretumevitowini.pdfIn PDF document text
    • https://kekebig.files.wordpress.com/2020/06/giwukeruwomijutilep.pdfIn PDF document text
    • https://giwivusimodo626075209.files.wordpress.com/2020/06/gatovevejivoxujojox.pdfIn PDF document text
    • https://pitimonuzoxa.files.wordpress.com/2020/06/dujitagasevujawijipitajaf.pdfIn PDF document text
    • https://tenafixufuvo.files.wordpress.com/2020/07/doxezowe.pdfIn PDF document text
    • https://detorodek.files.wordpress.com/2020/06/kedogutibotovu.pdfIn PDF document text
    • https://boxisev.files.wordpress.com/2020/06/rolukikokilanogavuboxefuw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5041/7827/files/gideripeloduze.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/3655/7987/files/levumowiduxuvofurevar.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/garul.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4959/8632/files/xanetoxabelovis.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9853/0201/files/kukenemenabal.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/24375498268.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4975/4519/files/pinipenaxumojuvometovado.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3796/5979/files/kifawati.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 7

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006f19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F19 5212 bytes
SHA-256: d42743cade0de1645eb5cbc1b282098e2bf758925d0c9fe5303c543621d36e4a
font_01_sfnt_off000080e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x80E4 10560 bytes
SHA-256: 8dfd86c8880c2ebda8ca701b26da4fcaadcbf2d0b8a1086b72d990ac25000412

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