Malicious PDF — malware analysis report

Static analysis result for SHA-256 eebb8b17ba70c414…

MALICIOUS

PDF

52.6 KB Created: 2020-08-06 12:53:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d7f5ccc741cab509bb296afa25e4fed3 SHA-1: 81b8d1dcc33e8de28ed1a2d52ac4b39a73a43366 SHA-256: eebb8b17ba70c414df9c638f26202e370dbda075478bacc19913d2fe42c8ccd7
152 Risk Score

Malware Insights

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

The PDF document was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. The document body, though partially corrupted, contains the URL 'https://ttraff.ru/pify?keyword=classroom+of+the+elite+light+novel+volume+9+pdf+download', which is likely used to lure victims. The PDF also contains a large number of embedded links, many pointing to Shopify domains, suggesting a link farm strategy to distribute malicious content.

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=classroom+of+the+elite+light+novel+volume+9+pdf+download
    • http://files.pawsacupuncture.com/uploads/1/3/2/6/132682134/nozofobepar.pdf
    • http://files.ceciliatrono.com/uploads/1/3/0/7/130739362/nodasudezefib.pdf
    • http://files.benallanoff.com/uploads/1/3/1/8/131857847/6759102e8.pdf
    • http://files.africabusinessreview.net/uploads/1/3/1/4/131407138/sozefofe-fenefuvejebezo-pavukusapeloset.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/38935964995.pdf
    • https://cdn.shopify.com/s/files/1/0431/6151/8231/files/fusionner_plusieurs_documents_gratuit.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/befuxaj.pdf
    • https://cdn.shopify.com/s/files/1/0440/8786/9592/files/fuwuguwanezenuk.pdf
    • https://cdn.shopify.com/s/files/1/0431/3884/2779/files/17230510256.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nazowexoratusitufunu.pdf
    • https://cdn.shopify.com/s/files/1/0436/4104/5145/files/31141829806.pdf
    • https://cdn.shopify.com/s/files/1/0431/2026/3322/files/58666948038.pdf
    • https://cdn.shopify.com/s/files/1/0431/1459/4466/files/95858931542.pdf
    • https://cdn.shopify.com/s/files/1/0429/2929/1427/files/68557070634.pdf
    • https://cdn.shopify.com/s/files/1/0430/1094/9273/files/giperumonutapomen.pdf
    • https://cdn.shopify.com/s/files/1/0433/7709/8910/files/mofaxiki.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006416.bin
9d0f23f16b5e1dbec40e1450137db2f74a590db50ce291f093c1a6d9b2e25def		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6416 5692 bytes
font_01_sfnt_off000077ea.bin
d99549794df6504ab73cb89f546a4cc838abdb2c39cd829cf8639158b4c55002		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77EA 5668 bytes
font_02_sfnt_off00008b18.bin
3aa6dcd99ca4d4471036c1a7fffa628fc350b47f460bff6e66119b4384e73d76		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B18 10324 bytes
font_03_sfnt_off0000ae95.bin
4bf7462e787791ee30cced4e4a0065977ba460b587ec5e4d0bf31a1282398818		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAE95 16416 bytes

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