Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9b7c66084ce5a95…

MALICIOUS

PDF

42.1 KB Created: 2020-08-08 18:15:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b129a8e7f3a321fc6b3042eccaf5bcf1 SHA-1: 90ceeca038475e6b89802be2d292dc77b0f85fe6 SHA-256: b9b7c66084ce5a95ad56d97ce982dc2b2700edb60a6d81ac93306ddb0287107f
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link farm designed to appear as academic papers, with the primary link leading to a known malicious redirector. The document body, though heavily obfuscated, contains the malicious URL and several other URLs hosted on Shopify and other domains, likely as part of the SEO manipulation. The ML classifier strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=bipartite+network+projection+and+personal+recommendation+pdf
    • http://files.munykorea.org/uploads/1/3/0/9/130968917/b4c69aad58.pdf
    • http://files.asifthinkingmatters.com/uploads/1/3/1/3/131378990/mirovos_rubiru_raburabuzofapo.pdf
    • http://nepila.john-hallberg.com/uploads/1/3/0/7/130775350/c061d.pdf
    • http://zolax.candellafabrica.com/uploads/1/3/2/6/132680813/nujeb.pdf
    • https://cdn.shopify.com/s/files/1/0437/9148/3032/files/jogemitafovaf.pdf
    • https://cdn.shopify.com/s/files/1/0434/7386/2808/files/nomaf.pdf
    • https://cdn.shopify.com/s/files/1/0428/4953/4111/files/juvisepoxubexofafepi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/34680977850.pdf
    • https://cdn.shopify.com/s/files/1/0433/1434/8197/files/33103509679.pdf
    • https://cdn.shopify.com/s/files/1/0441/0392/5912/files/happy_new_year_2017_song.pdf
    • https://cdn.shopify.com/s/files/1/0433/6245/1611/files/abraham_lincoln_speech.pdf
    • https://cdn.shopify.com/s/files/1/0434/8457/7956/files/71873472410.pdf
    • https://cdn.shopify.com/s/files/1/0433/7005/3784/files/kukudepiganenemap.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tijubijevuvikupox.pdf
    • https://cdn.shopify.com/s/files/1/0432/5395/6758/files/jenis_jenis_metode_blanching.pdf
    • https://cdn.shopify.com/s/files/1/0437/8856/6677/files/56608122983.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006472.bin
71b99e38e323ac450c7f57bb7708091cc377b1bc943eed111e5ca69d1ffac810		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6472 5584 bytes
font_01_sfnt_off00007775.bin
5ebd2c462bd96aec45f53823a50aafb34fd212a91c1d3aa8d5bbf1c23fadca9f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7775 10420 bytes

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