Malicious PDF — malware analysis report

Static analysis result for SHA-256 477ae789fe8e6bb8…

MALICIOUS

PDF

37.3 KB Created: 2020-09-19 07:16:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 19e47a75a476fc59aada058e578337ca SHA-1: 8fb0a5500065c81f75077192547ab20d3d13b47c SHA-256: 477ae789fe8e6bb850b3fd11ab41c5cc18a72f650df390f5608fec2e6aacd2ea
152 Risk Score

Malware Insights

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

The PDF contains a prominent link that redirects to a malicious URL, disguised with keywords related to a game. This is further supported by heuristics indicating a malicious redirector and a link farm. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the malicious URL and appears to be a lure.

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.link/wix?keyword=tennis+head+unblocked+2+player
    • http://files.husseyarchitects.com/uploads/1/3/1/4/131437464/tudimopejofeb.pdf
    • http://mibek.ernestob4arusd.com/uploads/1/3/1/4/131453723/dupesaj-wazunobu.pdf
    • http://files.beadart-austria.com/uploads/1/3/1/1/131164081/solax-jeruvipaze-vifuwaxa-zifinaxuso.pdf
    • https://067a97db-80a6-466e-99fb-bbbfa1283e1d.filesusr.com/ugd/4bb894_2ccc7ab28cbc441daa5e533864a5a3b9.pdf?index=true
    • https://aa12d29c-e39d-41db-bf4a-d1587adfad09.filesusr.com/ugd/c4ccc4_b2a0a3bcbace4180b45e2bbd56764afe.pdf?index=true
    • https://caa11350-19fb-4b12-9586-cfadeb8525a0.filesusr.com/ugd/43d598_8359dc86d413422484752fbee8111446.pdf?index=true
    • https://99be87e1-0417-4ce2-9de5-d1a06ecaa6cc.filesusr.com/ugd/fb5067_d0851b693cf549f0af396c9d17b6cf3a.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0431/6574/5314/files/96028775497.pdf
    • https://cdn.shopify.com/s/files/1/0437/7663/9127/files/caso_schreber_freud.pdf
    • https://cdn.shopify.com/s/files/1/0459/8861/0215/files/65142332494.pdf
    • https://a9b868c5-b0c9-4080-95ee-d0c2ab3a5406.filesusr.com/ugd/d90490_d6c44ae8fe814d75b63a9bc61203d1c1.pdf?index=true
    • https://340facb6-ae60-4b75-a1ae-cd800137ca78.filesusr.com/ugd/bb05c1_0c92cb36d7fb49eb86edbe85456e329b.pdf?index=true
    • https://3750bf62-1e46-417f-9462-e5f0546229e9.filesusr.com/ugd/105a8c_16d45df465784c929d311f2f95513ee7.pdf?index=true
    • 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_off0000534a.bin
e048743938dd7aaf97891dfd211076c87e11b238aa0f5062e2e8dc2763641b30
pdf-font-stream PDF embedded font (sfnt) at offset 0x534A 5548 bytes
font_01_sfnt_off00006625.bin
5190a171f7dde2a9a8a029679c574ab207a657e421f8fee10a1beb8826c5299b
pdf-font-stream PDF embedded font (sfnt) at offset 0x6625 10116 bytes