Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b05f5bbd1e25bc4…

MALICIOUS

PDF

50.0 KB Created: 2020-07-29 10:50:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d3eb6e60071baef5936f0f3be5a6afd3 SHA-1: a8160994583d31d608aafae2e37b3527c68f00f7 SHA-256: 0b05f5bbd1e25bc482d5853a83439b0f876107093b6f431dd9f30867c969dbe9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external websites, suggesting a link farm or SEO spamming operation. One of the primary links directs to a known malicious redirector, indicating a malicious intent to lead users to harmful content. The ML classifier also strongly flagged this PDF as malicious.

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/pify?keyword=energias+renovables+tesis+pdf
    • http://files.didilawson.com/uploads/1/3/0/7/130740591/batanoj_merevaven_vutijimipir_jumukegakewo.pdf
    • http://files.fairtradeswansea.org.uk/uploads/1/3/1/3/131398117/995100.pdf
    • http://files.sagebrushaviation.org/uploads/1/3/0/7/130776208/jodan.pdf
    • http://repositorio.usfq.edu.ec/handle/23000/4170
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/4156/8421/files/lifovelebabobagufevonuva.pdf
    • https://cdn.shopify.com/s/files/1/0429/5072/1699/files/kadumafelutimuz.pdf
    • https://cdn.shopify.com/s/files/1/0435/7111/8235/files/13388799722.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/73121007565.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gujogu.pdf
    • https://cdn.shopify.com/s/files/1/0431/3910/4917/files/54880807208.pdf
    • https://cdn.shopify.com/s/files/1/0434/5823/2473/files/39936002836.pdf
    • https://cdn.shopify.com/s/files/1/0434/8693/7253/files/saliriruzexaliti.pdf
    • https://cdn.shopify.com/s/files/1/0438/7006/0704/files/sivowezizosefuti.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pekazojifedabefotekufof.pdf
    • https://cdn.shopify.com/s/files/1/0432/2977/3981/files/82919474009.pdf
    • https://cdn.shopify.com/s/files/1/0429/7896/7703/files/bifigon.pdf
    • https://cdn.shopify.com/s/files/1/0430/0396/9689/files/86051803239.pdf
    • https://cdn.shopify.com/s/files/1/0435/3576/1576/files/3298616467.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_off00008027.bin
20f34025d3b098fb99123e2d54dae512885544fd1148c8c415a47ab478b0129a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8027 5156 bytes
font_01_sfnt_off000091bb.bin
02f21c3c8d586093c8010d0b9ac499f352e97806edd774ed87f8a9d72b93509d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x91BB 12808 bytes

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