Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c956eb206b616a3…

MALICIOUS

PDF

49.1 KB Created: 2020-08-05 16:49:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2010cf642bda2c21945fac41d4cbb51d SHA-1: fe450ec887ab4347fe187366b233efb08afbf6c2 SHA-256: 9c956eb206b616a3c7e49e6ac26c3c55326207e5ca72e79e91f63c00d58f0a52
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a mass external link farm, with a critical heuristic firing for a malicious redirector link. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/pify?keyword=ncert+biology+notes+class+12+pdf+free+download', which is also listed as a malicious redirector. This suggests the document is designed to trick users into downloading further malicious content by disguising it as educational material.

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=ncert+biology+notes+class+12+pdf+free+download
    • http://files.woozeyacresllc.com/uploads/1/3/1/6/131606257/rigalitutuxiku.pdf
    • http://files.classicalmusictoday.net/uploads/1/3/1/4/131437878/retip.pdf
    • http://files.catherinebliss.com/uploads/1/3/1/3/131378999/eb510dc82.pdf
    • http://files.gardenandpondmaintenance.co.uk/uploads/1/3/2/3/132302926/jokobirunewo.pdf
    • http://files.appel-stores.shop/uploads/1/3/1/6/131606630/sigipox.pdf
    • https://cdn.shopify.com/s/files/1/0436/9140/9562/files/66917850947.pdf
    • https://cdn.shopify.com/s/files/1/0436/4868/0089/files/morettin_estatstica_bsica.pdf
    • https://cdn.shopify.com/s/files/1/0437/7473/8586/files/kupetejafedokotajovem.pdf
    • https://cdn.shopify.com/s/files/1/0433/9191/0038/files/94256139885.pdf
    • https://cdn.shopify.com/s/files/1/0430/0357/6481/files/vidamulugiwaper.pdf
    • https://cdn.shopify.com/s/files/1/0437/8374/9781/files/carpenters_only_yesterday.pdf
    • https://cdn.shopify.com/s/files/1/0436/6509/6857/files/78274765356.pdf
    • https://cdn.shopify.com/s/files/1/0431/6564/7012/files/2807048998.pdf
    • https://cdn.shopify.com/s/files/1/0429/6579/4965/files/32261885826.pdf
    • https://cdn.shopify.com/s/files/1/0435/0020/8294/files/85185948683.pdf
    • https://cdn.shopify.com/s/files/1/0433/1290/6405/files/bezapejomomovamoju.pdf
    • https://cdn.shopify.com/s/files/1/0431/2052/5469/files/vorewijidofasekiburukiz.pdf
    • https://cdn.shopify.com/s/files/1/0433/2666/8952/files/30936514361.pdf
    • https://cdn.shopify.com/s/files/1/0434/0878/5562/files/56367021592.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_off00007fa7.bin
46c41c7c59b6ae1318fd2611c33c791792ee078ab4ca28ee37887409efc1648f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FA7 5812 bytes
font_01_sfnt_off000093a5.bin
a904354d22ee9e02a39afeec0ff740526a52e6308c33b82040ac4fb4259e7b15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x93A5 10248 bytes

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