Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e2e20f57c2e1295…

MALICIOUS

PDF

50.9 KB Created: 2020-07-14 23:34:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 994a3145ebde85ec985c6233c140da9b SHA-1: 770e8d144c6d4cd9ac8c31222c5e0f69009a6b21 SHA-256: 6e2e20f57c2e1295325b0273c4f8f366064ef102c74f23b33266c134ed37bac8
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to link farms designed to manipulate search engine results. One critical heuristic firing indicates a link to known malicious redirector infrastructure, suggesting the document is part of a phishing or scam campaign. The ML classifier strongly supports the malicious verdict.

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.cc/wb?keyword=enhancing%20self%20esteem%20in%20the%20classroom%20pdf
    • http://files.rachelbrodie.net/uploads/1/3/1/4/131482832/kategigubemez.pdf
    • http://files.debraflatimer.com/uploads/1/3/0/9/130969476/31c97.pdf
    • http://files.koahspearguns.com/uploads/1/3/0/8/130813849/worabugesezu_fowipe.pdf
    • http://files.addvocate4coaching.com/uploads/1/3/1/8/131856567/turipulavetumasaza.pdf
    • http://files.ronnieroseband.com/uploads/1/3/0/8/130813797/a7f99.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://tigifelaziv.files.wordpress.com/2020/06/rofow.pdf
    • https://bokifib.files.wordpress.com/2020/07/35159810066.pdf
    • https://wibixeso.files.wordpress.com/2020/07/vuxuvedibuj.pdf
    • https://wijulibo.files.wordpress.com/2020/07/94926634433.pdf
    • https://pubexakaja.files.wordpress.com/2020/07/39805850000.pdf
    • https://gesifazu.files.wordpress.com/2020/06/72462807234.pdf
    • https://lamuraxinu.files.wordpress.com/2020/07/rufovutapemapimunamu.pdf
    • https://kawumafovod.files.wordpress.com/2020/06/natupemupomuxuvejorumabu.pdf
    • https://nifipumed.files.wordpress.com/2020/06/konubatig.pdf
    • https://nikadafit.files.wordpress.com/2020/07/woxagokaro.pdf
    • https://cdn.shopify.com/s/files/1/0429/6019/1641/files/gerorosegezazefukipugefo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vololo.pdf
    • https://cdn.shopify.com/s/files/1/0429/9754/7157/files/11026502619.pdf
    • https://cdn.shopify.com/s/files/1/0431/5738/9472/files/90547747306.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/30151397197.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tedogunugovosilogupex.pdf
    • https://cdn.shopify.com/s/files/1/0434/5495/5672/files/gubudokixevotadibeta.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_off000089dc.bin
59c8306ee2bf4e9f6c86fd627f6f31d0be4b42a5674e1b2f45055eb2ab1f35f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89DC 5312 bytes
font_01_sfnt_off00009bae.bin
a1ed992789d3259ec0f676842279efdbf277b765b35ecb5e3a799cdbb93aa735		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9BAE 9980 bytes

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