Malicious PDF — malware analysis report

Static analysis result for SHA-256 187b1503ef0ce18f…

MALICIOUS

PDF

42.5 KB Created: 2020-09-03 21:30:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 316cf2292c0ac6d82baf0289e0e30fba SHA-1: 09a8e2b51f55f92ede7d96410cb31320687c9dc6 SHA-256: 187b1503ef0ce18f0db4506bc9e174fe417dc6ae84867f27c1bd4f413fb7ac16
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm designed to redirect users. One prominent link, 'https://ttraff.me/wix?keyword=chrome+for+windows+8+32+bit', is flagged as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to trick users into downloading or navigating to malicious content.

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.me/wix?keyword=chrome+for+windows+8+32+bit
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/ab059d_7bc25830c34543cabc907288d0f30a5a.pdf
    • https://static.usrfiles.com/ugd/be19e1_53253c50cfc6443883ae245e8fbacdbb.pdf
    • https://static.usrfiles.com/ugd/b8c837_c87dbd217165444982bf33fe136bafaa.pdf
    • https://static.usrfiles.com/ugd/b8c837_f5165d1bd4e94c2793f58665650ca498.pdf
    • https://static.usrfiles.com/ugd/b8c837_a4ce9aa8831b4a8ea48267412f993133.pdf
    • https://static.usrfiles.com/ugd/b4609a_dc0081e65e11468c816af8e22fd50620.pdf
    • https://cdn.shopify.com/s/files/1/0450/1933/2766/files/alimentacion_escolar_saludable.pdf
    • https://cdn.shopify.com/s/files/1/0430/3673/7699/files/nalekabejesub.pdf
    • https://cdn.shopify.com/s/files/1/0431/8127/7352/files/88002190424.pdf
    • https://cdn.shopify.com/s/files/1/0437/7713/0658/files/david_g_myers_psychology_11th_editio.pdf
    • https://cdn.shopify.com/s/files/1/0428/2449/9367/files/41407952853.pdf
    • https://cdn.shopify.com/s/files/1/0433/1008/8360/files/berujajajozizavakoniren.pdf
    • https://cdn.shopify.com/s/files/1/0431/0319/1194/files/free_al_quran_indonesia_for_pc.pdf
    • https://cdn.shopify.com/s/files/1/0438/1474/8322/files/jacuzzi_pool_pump.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000065dc.bin
5be33a8b32de86f2ca9608fad67989987016591d66e1b6345d9c5cb619449846
pdf-font-stream PDF embedded font (sfnt) at offset 0x65DC 5532 bytes
font_01_sfnt_off00007890.bin
b6febe942c2be1c9e4bb883a029aa0fc76d8595ec7e34a9bd6f990925ef7a9cc
pdf-font-stream PDF embedded font (sfnt) at offset 0x7890 10768 bytes