Malicious PDF — malware analysis report

Static analysis result for SHA-256 6728858867663fa2…

MALICIOUS

PDF

43.0 KB Created: 2020-08-06 04:06:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b2419fc11fcdfb6683d2f10a060006f3 SHA-1: 99ce63d761ea7effd8f61cc66b529d09f3b1d3ea SHA-256: 6728858867663fa2e58412b07beeda1a9f2ec4da2710869544ca0a0f0bde34b1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links disguised as downloadable content, redirecting to a link farm. The primary malicious link identified is https://ttraff.ru/pify?keyword=business+communication+essentials+4th+canadian+edition+pdf+download, which is part of a larger infrastructure designed to distribute further malicious content. The ML classifier strongly indicated maliciousness.

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.ru/pify?keyword=business+communication+essentials+4th+canadian+edition+pdf+download
    • http://files.courtneyjette.com/uploads/1/3/1/3/131378990/200672.pdf
    • http://files.cshwhalingmuseum.org/uploads/1/3/0/7/130775192/bilamuvifosixar.pdf
    • http://files.graceandgritshop.com/uploads/1/3/1/3/131398140/4946391.pdf
    • http://files.maevanaturals.com/uploads/1/3/2/3/132303359/niduvovanaxonib-tafisumuzemo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/8852/7013/files/kidetamazoj.pdf
    • https://cdn.shopify.com/s/files/1/0432/4327/4395/files/semomipojezabewalum.pdf
    • https://cdn.shopify.com/s/files/1/0433/0163/4213/files/berlitz_espanol_niveles_1_2.pdf
    • https://cdn.shopify.com/s/files/1/0438/4020/9056/files/xubarakuworolujizomulebe.pdf
    • https://cdn.shopify.com/s/files/1/0430/7533/8389/files/pelamaredawamapuged.pdf
    • https://cdn.shopify.com/s/files/1/0432/1515/9458/files/respiracion_celular_aerobia_y_anaerobia.pdf
    • https://cdn.shopify.com/s/files/1/0436/0683/5358/files/masobepizetaxumibetidajew.pdf
    • https://cdn.shopify.com/s/files/1/0432/9986/4734/files/29111594577.pdf
    • https://cdn.shopify.com/s/files/1/0431/6348/4315/files/79084843160.pdf
    • https://cdn.shopify.com/s/files/1/0433/5996/1239/files/twelve_ordinary_men.pdf
    • https://cdn.shopify.com/s/files/1/0431/1423/4016/files/free_microsoft_word_download.pdf
    • https://cdn.shopify.com/s/files/1/0439/1016/8744/files/21901528156.pdf
    • https://cdn.shopify.com/s/files/1/0433/4298/7422/files/51886173571.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_off0000692a.bin
febbf73496405539d17010a11a46852dbdf1efbe4ae0ef4f630d7559a593dd03		 pdf-font-stream PDF embedded font (sfnt) at offset 0x692A 5528 bytes
font_01_sfnt_off00007bee.bin
8210ab0bf86b19617a4545b751ca95698c6c90f719c05984ac84d3dd524335c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BEE 10128 bytes

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