Malicious PDF — malware analysis report

Static analysis result for SHA-256 8465572be55ef7de…

MALICIOUS

PDF

49.4 KB Created: 2020-08-12 01:15:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dc81e55444fdab748768a053c33b1b70 SHA-1: 06136334298b8ae606f9c1a9609c7d113f80944f SHA-256: 8465572be55ef7de389588baf630ae1f2b82009c8904d472004e844395a9926f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector, indicating an attempt to lead the user to malicious infrastructure. It also hosts a large number of external PDF links, suggesting a link farm or SEO abuse tactic. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

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=vocabulary+exercises+for+advanced+students+pdf
    • http://xorofipo.deckpostcaddy.com/uploads/1/3/0/8/130814124/7ca06f.pdf
    • http://files.monsieurcreations.com/uploads/1/3/2/3/132303245/zopiruzulewefawawuv.pdf
    • http://files.andreakim.co/uploads/1/3/1/3/131379692/1954067.pdf
    • http://files.blankspacestudiohk.com/uploads/1/3/1/8/131856672/6f2490351bb9aae.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/7122/3446/files/30700297870.pdf
    • https://cdn.shopify.com/s/files/1/0438/1753/3597/files/kunulonerusarorofu.pdf
    • https://cdn.shopify.com/s/files/1/0432/3108/4708/files/veraxonabalarejetabobaj.pdf
    • https://cdn.shopify.com/s/files/1/0431/1423/4017/files/16918725887.pdf
    • https://cdn.shopify.com/s/files/1/0432/3452/5347/files/adeste_fideles.pdf
    • https://cdn.shopify.com/s/files/1/0437/7391/9393/files/4202071048.pdf
    • https://cdn.shopify.com/s/files/1/0431/2521/1296/files/voa_e5_8d_ab_e8_a7_86.pdf
    • https://cdn.shopify.com/s/files/1/0441/3738/2040/files/lewoxarusenagopefogave.pdf
    • https://cdn.shopify.com/s/files/1/0430/8559/4775/files/jikobevusobegadujiviviz.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000061c3.bin
861bfb7eb98dc7af7c83391dffca61cfa056625cfb9ae8633b9119029edcd09e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61C3 5484 bytes
font_01_sfnt_off00007473.bin
cd008f8d50b352213f06ba1f4b1b071cd966d7a6c71acff1aeabc275819a8311		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7473 1832 bytes
font_02_sfnt_off00007d50.bin
c96c867992e71e4f6638be3b94a5a44a6b0ea8757297d94a3132f90cac414f9d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D50 10524 bytes
font_03_sfnt_off0000a14f.bin
bf0029f2f65a8d03fc5bc6dac3f89872448ee76276b38fcd79a4881ba082e330		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA14F 16508 bytes

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