Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5dcccfe96c09cf1…

MALICIOUS

PDF

41.8 KB Created: 2020-08-20 23:10:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 08888bb3f6140b47a7abe4fa4d8281ed SHA-1: af708f671a8ad15cc1c7b332ddc1b8885964bd69 SHA-256: d5dcccfe96c09cf1d1d208a1eddfff00bb70479133d7e784dc3d80d89e13a6ec
152 Risk Score

Malware Insights

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

This PDF document contains a high density of embedded links, many of which point to external resources. One critical heuristic identified a link to a known malicious redirector infrastructure at 'https://ttraff.cc/pify?keyword=aptitude+test+for+engineering+placements+pdf'. The document body, though heavily obfuscated, also contains this URL, suggesting the primary intent is to redirect the user to malicious content. The ML classifier strongly supports the malicious nature of this PDF.

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.cc/pify?keyword=aptitude+test+for+engineering+placements+pdf
    • http://files.christchapelmaine.org/uploads/1/3/2/3/132303075/foxigitodatipup-budosasap-dutameg.pdf
    • http://xaxaf.loujessop.com/uploads/1/3/0/7/130776208/a234742805c.pdf
    • http://vexedoreb.sirwaffle.com/uploads/1/3/0/7/130775126/5003919.pdf
    • http://fixawemo.businessbuddiesllc.com/uploads/1/3/1/3/131384362/pumutamomo-gotovidewetiwij-lizod.pdf
    • https://cdn.shopify.com/s/files/1/0435/6525/2771/files/mesenteric_lymphadenitis_in_child.pdf
    • https://cdn.shopify.com/s/files/1/0464/7275/7406/files/incident_report_writing_training_video.pdf
    • https://cdn.shopify.com/s/files/1/0434/4430/6086/files/magisterium_book_5_free.pdf
    • https://cdn.shopify.com/s/files/1/0438/1822/1730/files/wilibokebusadawupox.pdf
    • https://cdn.shopify.com/s/files/1/0431/8894/5064/files/60748002813.pdf
    • https://cdn.shopify.com/s/files/1/0440/2990/2998/files/78282455580.pdf
    • https://cdn.shopify.com/s/files/1/0435/5116/2517/files/3dmark_2010_free.pdf
    • https://cdn.shopify.com/s/files/1/0432/6191/9396/files/vofedikusozotejo.pdf
    • https://cdn.shopify.com/s/files/1/0435/9503/8877/files/podilebubise.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/gibowutobarifokegibig.pdf
    • https://cdn.shopify.com/s/files/1/0428/2672/7580/files/kedipobukov.pdf
    • https://cdn.shopify.com/s/files/1/0430/8975/6311/files/karetexelivelutuvuregalo.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_off000062e6.bin
5eb8fc15e477567f4ee7cd24a211f93b1e8efc44495684642dfd0a90b75dd01e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62E6 5464 bytes
font_01_sfnt_off00007564.bin
cdb66b247b7c85287d391cad27528f2c46847039af446def1ddd4b6a971b2174		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7564 10780 bytes

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