Malicious PDF — malware analysis report

Static analysis result for SHA-256 55d8958b6b5dce71…

MALICIOUS

PDF

50.9 KB Created: 2020-08-13 23:42:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a453598f1ee807fbe31d1674c3c8192d SHA-1: 11c48f41f93c832e73299d5b1d0fe90fcd49d506 SHA-256: 55d8958b6b5dce71db466bc6b99439669569c0973f95fcfa593d8e197b6abaa2
150 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics for containing malicious redirector links and a large number of external links. The primary malicious URL identified is https://ttraff.cc/pify?keyword=format+of+descriptive+paragraph+class+9, which is likely used to funnel users to further malicious content. The document body, though heavily obfuscated, contains references to the same redirector URL, reinforcing its malicious intent.

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/pify?keyword=format+of+descriptive+paragraph+class+9
    • http://fudek.collageofwomenartists.com/uploads/1/3/2/6/132695384/laver-jovanizuzevaxo.pdf
    • http://menuvajom.thecovenantschristandyou.com/uploads/1/3/1/1/131164250/mukuzegazatawe-jelakixivixo-rogulabat.pdf
    • http://gotuzofo.hamptonsgarage.com.au/uploads/1/3/0/8/130874284/rajaxavamuwotalomime.pdf
    • http://files.insulators41.com/uploads/1/3/2/6/132680808/bimarovabotexilukuz.pdf
    • https://cdn.shopify.com/s/files/1/0428/6971/9196/files/naganimuzipa.pdf
    • https://cdn.shopify.com/s/files/1/0438/2107/2546/files/pseudophakic_bullous_keratopathy.pdf
    • https://cdn.shopify.com/s/files/1/0429/2254/1209/files/51111714107.pdf
    • https://cdn.shopify.com/s/files/1/0432/9163/9966/files/32475283256.pdf
    • https://cdn.shopify.com/s/files/1/0431/0158/5569/files/ms_excel_2020_notes.pdf
    • https://cdn.shopify.com/s/files/1/0428/8187/6131/files/bienes_raices_mario_esquivel.pdf
    • https://cdn.shopify.com/s/files/1/0436/3337/7440/files/download_book_learn_english.pdf
    • https://cdn.shopify.com/s/files/1/0437/4121/6929/files/makaziwisufo.pdf
    • https://cdn.shopify.com/s/files/1/0432/1994/3579/files/watch_bad_girls_club_season_16.pdf
    • https://cdn.shopify.com/s/files/1/0431/6971/0242/files/bolufolibivurokedu.pdf
    • https://cdn.shopify.com/s/files/1/0437/6756/2391/files/2277702841.pdf
    • https://cdn.shopify.com/s/files/1/0430/6350/9141/files/75567085880.pdf
    • https://cdn.shopify.com/s/files/1/0430/9726/0192/files/83830843239.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_off000087d8.bin
6f75f5e77a467c18dac06514433b277a63ebd37817809635ab4a992c5d1b1434
pdf-font-stream PDF embedded font (sfnt) at offset 0x87D8 5740 bytes
font_01_sfnt_off00009b49.bin
0f48b53bcf2497c451d819681fbac9cdef2aafb9db65c7c88d21bab5357fb8b8
pdf-font-stream PDF embedded font (sfnt) at offset 0x9B49 10128 bytes