Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ba5171909c650c7…

MALICIOUS

PDF

47.2 KB Created: 2020-08-31 02:55:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 679760474a8bb8d5c2d75ef46b5adb0d SHA-1: bb735581de94a0035cfe2428cdd2c18d2206265b SHA-256: 0ba5171909c650c7375742d4c195e39d2f729c8cfc7866e5b72e9ab674dda9e3
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of embedded links, many of which point to external resources. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.cc/wix?keyword=ora%25C3%25A7%25C3%25B5es+subordinadas+adjetivas+exercicios+com+gabarito+9+ano'. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to disguise malicious activity as educational content. The ML classifier strongly indicates maliciousness.

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/wix?keyword=ora%25C3%25A7%25C3%25B5es+subordinadas+adjetivas+exercicios+com+gabarito+9+ano
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b4609a_ed85bcc8fcaf4988bd8b085c352fe0b5.pdf
    • https://static.usrfiles.com/ugd/b8c837_4b2644d78f39464fa3d97d8f0891de10.pdf
    • https://static.usrfiles.com/ugd/760101_07b68c4c9476415cad82265167b94cad.pdf
    • https://static.usrfiles.com/ugd/b7ab08_c7a90dc63fdb4ad08d37b3e4b1c01ff1.pdf
    • https://static.usrfiles.com/ugd/33a2e4_e3d2feab89c9485a923e305c3b32920b.pdf
    • https://static.usrfiles.com/ugd/b8c837_c348125c14e743af95484c08f42a5667.pdf
    • https://static.usrfiles.com/ugd/0cd019_ac3adc260d7e46d8a3d85d0f2caf48d7.pdf
    • https://static.usrfiles.com/ugd/353d00_d7b17d2a26264e5090a18696feb6449a.pdf
    • https://cdn.shopify.com/s/files/1/0439/3975/8235/files/xavuj.pdf
    • https://cdn.shopify.com/s/files/1/0431/9569/5268/files/27605021852.pdf
    • https://cdn.shopify.com/s/files/1/0432/6857/1299/files/electrical_engineering_mcqs_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/2898/7547/files/98825848665.pdf
    • https://static.usrfiles.com/ugd/a58b01_1734669d1d9a4db888de90f82243ed48.pdf
    • https://static.usrfiles.com/ugd/edb4a7_943edc1b5c7f4fb4b76d96395a433ab9.pdf
    • https://static.usrfiles.com/ugd/b42fd6_677fe94fded242f9939a919d5014416c.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006939.bin
40bfabb8d8e18286e59de58a62aeaa740cdd8faa20f11b00ff6bb925771c07e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6939 6156 bytes
font_01_sfnt_off00007d8a.bin
a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D8A 1800 bytes
font_02_sfnt_off00008617.bin
ae15d44b19a557dd574ed07b16c548e76f2df38d0735371cb72c5fdd16290e1b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8617 12620 bytes

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