Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e2e2548d050660c…

MALICIOUS

PDF

45.2 KB Created: 2020-07-20 03:40:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 672578ba20161920aeb4b9ddecce556d SHA-1: 91af6a2ceb10b871e4f2f0b44e656e7f12226ef6 SHA-256: 6e2e2548d050660cd633aad548d11b1fe18d85145ee4624ee9d0740ca192eb06
154 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many of which point to known malicious redirector infrastructure, disguised as a free book download. The ML classifier strongly indicates maliciousness, and the heuristic firings confirm the presence of malicious redirector links and a link farm. No scripts were extracted from this sample, but the embedded URLs are the primary indicators of compromise.

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=oliveboard%20puzzle%20mania%20book%20pdf%20free%20download
    • http://files.beckymathisportraits.com/uploads/1/3/2/3/132303315/4267190.pdf
    • http://files.cornerstoneuk.org/uploads/1/3/2/6/132681993/5013956.pdf
    • http://files.rivermenrodandgunclub.com/uploads/1/3/2/3/132302973/nomegariwutok-wibiwu-visinatixubuj-sojimuta.pdf
    • http://files.iccsprogram.org/uploads/1/3/1/4/131406412/gibimami_kefimub.pdf
    • http://files.kylejnorris.com/uploads/1/3/0/8/130813558/e7f44a7.pdf
    • http://files.sunnyandsavvyrootsco.com/uploads/1/3/1/6/131637701/bifokogosuk.pdf
    • http://files.katherineoday.com/uploads/1/3/1/4/131406303/tazivumipituxu_nifigoxedojim_nugimuvosi_garavazaluk.pdf
    • http://files.km4kate.com/uploads/1/3/0/7/130775249/5707b3ac388e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://bazebibirolo.files.wordpress.com/2020/07/buzisukojopifakukiniwiteb.pdf
    • https://remokizob.files.wordpress.com/2020/07/29946661669.pdf
    • https://tojugodusino.files.wordpress.com/2020/06/16759937494.pdf
    • https://retolipe116851667.files.wordpress.com/2020/07/jamiwagaj.pdf
    • https://fowexafo831514887.files.wordpress.com/2020/07/7292185184.pdf
    • https://cdn.shopify.com/s/files/1/0431/7567/4014/files/vabukuvadebirumeludeluzar.pdf
    • https://cdn.shopify.com/s/files/1/0432/1338/9992/files/zizutexunafemovijegolop.pdf
    • https://cdn.shopify.com/s/files/1/0432/9281/9616/files/tewasexekutunoku.pdf
    • https://cdn.shopify.com/s/files/1/0430/0849/1673/files/tepopunadulumulosavemizo.pdf
    • https://cdn.shopify.com/s/files/1/0433/6808/7701/files/povekezufejafipesodulasa.pdf
    • https://cdn.shopify.com/s/files/1/0432/0890/0772/files/95964416899.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mirogorozizodixomalejog.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/51191810805.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/49221060197.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_off00007289.bin
098842387da748a8628ba7316bd4890e492b274f9986f04a745b03958052fb11		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7289 5244 bytes
font_01_sfnt_off00008456.bin
03de8e12eee8699f8b7c1d46dd1779fe26947c6aacda1a66f3c5331eff3f8eaf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8456 10500 bytes

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