Malicious PDF — malware analysis report

Static analysis result for SHA-256 660ee90a9a2a4ae5…

MALICIOUS

PDF

50.6 KB Created: 2020-08-29 18:01:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d7ae746b2bc92487cda2885162292232 SHA-1: 9f90f713779ecf9d599a9f16563abe695a2d8186 SHA-256: 660ee90a9a2a4ae571bc99725a55c5d0e58731db442559685a9c0a7349465ae9
154 Risk Score

Malware Insights

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

The PDF contains a link disguised as a document title, which redirects to a known malicious infrastructure. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms this behavior. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the malicious URL.

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.com/wix?keyword=metodologia+dela+investigacion+educativa+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_74b57338578845ef8460befcdf8554ad.pdf
    • https://static.usrfiles.com/ugd/b8c837_2d77b55810b44e66b0a011550b59a5db.pdf
    • https://static.usrfiles.com/ugd/b8c837_db717865b5ba41c1bcb094b2cef30467.pdf
    • https://cdn.shopify.com/s/files/1/0454/3918/9142/files/xejijigisipanutulupuvex.pdf
    • https://cdn.shopify.com/s/files/1/0429/9902/1717/files/sazigafutojikafivomuzofup.pdf
    • https://cdn.shopify.com/s/files/1/0437/9394/0629/files/chuyen_dang_hinh_sang_word.pdf
    • https://cdn.shopify.com/s/files/1/0434/1363/5226/files/verithanam_vijay_video_song.pdf
    • https://cdn.shopify.com/s/files/1/0430/0609/9605/files/mental_arithmetic_book_4_answers_test_2.pdf
    • https://cdn.shopify.com/s/files/1/0434/0816/2974/files/tosebimekovamepitim.pdf
    • https://static.usrfiles.com/ugd/b8c837_15f594087dc04933bad9918a5812b228.pdf
    • https://static.usrfiles.com/ugd/b8c837_ab6f624208d14055b47fa3dfeb5fb1d9.pdf
    • https://static.usrfiles.com/ugd/b8c837_477a2f7ce58d46349de1f9bbf83a2e81.pdf
    • https://static.usrfiles.com/ugd/b8c837_5ad9b255d5cf4ba5b5ac3a68487226bd.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_off000083e0.bin
19b9e08583876f7af3fca4e66b9814986f00c27eee7848110c96deae449d9336
pdf-font-stream PDF embedded font (sfnt) at offset 0x83E0 5292 bytes
font_01_sfnt_off0000960e.bin
ca8b0982005862b93b30152e14c76c06ed8964e437f0647b9797013656efeb5a
pdf-font-stream PDF embedded font (sfnt) at offset 0x960E 11576 bytes