Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e4482bc28d4f05b…

MALICIOUS

PDF

41.7 KB Created: 2020-08-12 10:19:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 088e9f4ca3e133450ed632ac0f34f986 SHA-1: 59801178113f0a2adbec2e1c91a6b478bada4379 SHA-256: 0e4482bc28d4f05b9324774c82ca78bcee47a1b4318f0a0d012f732a2c437736
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, with one identified as a known malicious redirector. The document body, though heavily obfuscated, includes the URL 'https://ttraff.ru/wb?keyword=prysmian%20cable%20pdf', suggesting a lure related to Prysmian cables. The presence of a large number of external PDF links, many pointing to Shopify, indicates a potential SEO link farm or a method to obscure the malicious redirector. 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.ru/wb?keyword=prysmian%20cable%20pdf
    • http://files.dancinggoatsanctuary.com/uploads/1/3/2/6/132695517/aa1baf1498.pdf
    • http://files.mjmediabox.com/uploads/1/3/2/6/132682790/bowoxakaboguboxabixi.pdf
    • http://files.accelerateddentalacademy.com/uploads/1/3/1/4/131437380/gejaxikidow.pdf
    • http://files.kristenwu.com/uploads/1/3/1/3/131380728/balinaropatinoj-sakito-xewigajikovixer.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0449/9403/5880/files/repeated_addition_arrays_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0437/7736/0029/files/29087049348.pdf
    • https://cdn.shopify.com/s/files/1/0432/4343/8244/files/21336885439.pdf
    • https://cdn.shopify.com/s/files/1/0429/2247/5687/files/biogeography_mark_v_lomolino.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/dejotoxirebogoro.pdf
    • https://cdn.shopify.com/s/files/1/0436/9943/7721/files/action_replay_max_ps2.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/9715790575.pdf
    • https://cdn.shopify.com/s/files/1/0431/7567/4012/files/34169383519.pdf
    • https://cdn.shopify.com/s/files/1/0435/1941/0335/files/pesovegobomatipina.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/memew.pdf
    • https://cdn.shopify.com/s/files/1/0429/2270/5063/files/semerugofawov.pdf
    • https://cdn.shopify.com/s/files/1/0431/7921/2959/files/diwagazeduwajin.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_off000065af.bin
e248636c72ba93a69cd6979ebebdbcb8debd55480dfedc54c3e1b69186a1c082		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65AF 5544 bytes
font_01_sfnt_off00007860.bin
63dca3ff4657dc529da1d8662a188fffad0fa981a48987bd3d2f809e37b30c95		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7860 9952 bytes

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