Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcff98ac2b0cafa4…

MALICIOUS

PDF

48.7 KB Created: 2020-08-30 00:45:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a1117a901da70e232dfe10426befa476 SHA-1: 4168ce2b5266a6d817d411c86bfb32b61e54b9c4 SHA-256: dcff98ac2b0cafa4963b52f5b4e4b7555b8b5ef985958a04a66a21325ae90431
150 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a free download for a "First aid step 2 ck 9th edition pdf download free". The document body and embedded URLs indicate a link farm strategy, with the primary malicious URL being ttraff.cc. The ML classifier strongly supports the malicious nature of this PDF.

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.cc/wix?keyword=first+aid+step+2+ck+9th+edition+pdf+download+free
    • https://static.usrfiles.com/ugd/1decf9_485f789168ac47eab8aee47a32ea6fc5.pdf
    • https://static.usrfiles.com/ugd/b8c837_25bc10c4aeab49bfb623038ca7ad96a6.pdf
    • https://static.usrfiles.com/ugd/eed56f_7f099380ee38418f8dfd8baff96ecdd5.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zorugeligix.pdf
    • https://cdn.shopify.com/s/files/1/0429/2732/5343/files/15106862055.pdf
    • https://cdn.shopify.com/s/files/1/0432/8439/8236/files/zazaranexe.pdf
    • https://cdn.shopify.com/s/files/1/0428/5179/5107/files/snake_game_code.pdf
    • https://cdn.shopify.com/s/files/1/0433/6409/0006/files/9396712.pdf
    • https://cdn.shopify.com/s/files/1/0432/6712/9504/files/64685742331.pdf
    • https://cdn.shopify.com/s/files/1/0431/9772/6880/files/autosketch_program_free.pdf
    • https://cdn.shopify.com/s/files/1/0434/0223/1971/files/gta_iv_trainers.pdf
    • https://cdn.shopify.com/s/files/1/0435/4693/5447/files/genijivegibonoluvu.pdf
    • https://cdn.shopify.com/s/files/1/0437/3551/5290/files/99132686741.pdf
    • https://cdn.shopify.com/s/files/1/0439/0181/2904/files/beethoven_biography.pdf
    • https://cdn.shopify.com/s/files/1/0439/1947/4856/files/3973891155.pdf
    • https://cdn.shopify.com/s/files/1/0445/7873/4239/files/makalah_keberagaman_agama_di_indonesia.pdf
    • https://cdn.shopify.com/s/files/1/0429/6015/8873/files/pdf_file_resize_software.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000074f8.bin
9796b1a34491539b33f44d09e910ba590afff632a2489bd976506ff24fa9f236
pdf-font-stream PDF embedded font (sfnt) at offset 0x74F8 5640 bytes
font_01_sfnt_off00008830.bin
51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0
pdf-font-stream PDF embedded font (sfnt) at offset 0x8830 1800 bytes
font_02_sfnt_off000090be.bin
8ccb3b4e9fb672c6711bda9c2e3526aba836d8e0dfd7aaceaaad5f0e5f5e00dc
pdf-font-stream PDF embedded font (sfnt) at offset 0x90BE 10648 bytes