Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb1af6269f4d3bd3…

MALICIOUS

PDF

41.7 KB Created: 2020-08-29 12:42:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: afcfee0adf6f0b87bd3d2943690e30c9 SHA-1: dcfdca38004c15af23104123a09db697bd7d40b9 SHA-256: bb1af6269f4d3bd30be61af5335cc26241f95e7614e944e36d41cee7d2722086
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, a common tactic for SEO poisoning and phishing. One of these links, https://ttraff.me/wix?keyword=atlas+skill+tree+guide, is identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, reinforcing its malicious intent. The ML classifier strongly supports the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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.me/wix?keyword=atlas+skill+tree+guide
    • https://cdn.shopify.com/s/files/1/0428/4517/5971/files/tratados_y_convenios_internacionales_para_promover_el_desarrollo_sustentable.pdf
    • https://cdn.shopify.com/s/files/1/0432/4117/7248/files/kuzugotiko.pdf
    • https://cdn.shopify.com/s/files/1/0431/5113/0785/files/al_quran_only_bangla_translation_free_download.pdf
    • https://static.usrfiles.com/ugd/b8c837_7b08baf284bd45c2bbd8604b98a96420.pdf
    • https://static.usrfiles.com/ugd/b8c837_b6cf8d4de3bd446381b38522134f901c.pdf
    • https://static.usrfiles.com/ugd/b8c837_a8b90daa7390458ea6841abb6d697056.pdf
    • https://static.usrfiles.com/ugd/b8c837_13949a42db8247f8b44fcf2be7f40b70.pdf
    • https://static.usrfiles.com/ugd/b8c837_9f57a5ba806046d4a72a8a2e41809605.pdf
    • https://static.usrfiles.com/ugd/b8c837_7a8ad91729344fc3b58bda20d64696c8.pdf
    • https://static.usrfiles.com/ugd/b8c837_2bdde3db51014cc2a19e0e9b2818c8ff.pdf
    • https://static.usrfiles.com/ugd/b8c837_d66553ee05be4671849974c5d1e81d77.pdf
    • https://static.usrfiles.com/ugd/b8c837_278e1fd19dc347cab010a2f6a4565665.pdf
    • https://static.usrfiles.com/ugd/c12414_48d17cdaf18b4dc89437fb0137bcb224.pdf
    • https://static.usrfiles.com/ugd/b8c837_0cb8066e69944cc9bdfc536065c7eb98.pdf
    • https://static.usrfiles.com/ugd/b8c837_9f17d751fc474b378b224660dbe8a829.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_off0000665f.bin
0a27371e2d53c574d2aec8d02235bf2b95141787c3197013efca94c215e39c18		 pdf-font-stream PDF embedded font (sfnt) at offset 0x665F 5044 bytes
font_01_sfnt_off0000778c.bin
a263cf7ffce47921bd349cbd77847563667e47490c6001327b193acf6e4013b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x778C 10188 bytes

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