Malicious PDF — malware analysis report

Static analysis result for SHA-256 7349476f7aa23f05…

MALICIOUS

PDF

45.7 KB Created: 2020-08-30 14:33:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 17d05787f3e6d18420ff0a27901bb4b6 SHA-1: 73cc84c6293bbb7df5011ccfc6a07f7e403ee2de SHA-256: 7349476f7aa23f050a6f66806ab05618580e4822f7df1d6d26d4d04df522a8c8
174 Risk Score

Malware Insights

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

The PDF contains a link that redirects to known malicious infrastructure, disguised with a lure related to 'whatsapp on pc windows 10'. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK and the ML classifier strongly indicate malicious intent. The document also contains a large number of external PDF links, suggesting it is part of a link farm designed to manipulate search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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.cc/wix?keyword=whatsapp+on+pc+windows+10
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/6908d7_c87b810f62e04fddb802e48bed33386e.pdf
    • https://static.usrfiles.com/ugd/735189_402e306453844cd0a46037964d61e7d2.pdf
    • https://static.usrfiles.com/ugd/b8c837_d1388fc8b3d64c2992cb931b9f52fd4a.pdf
    • https://static.usrfiles.com/ugd/405339_b9720eab906a4b2fbed88c897817c79e.pdf
    • https://static.usrfiles.com/ugd/271e65_a6e42f9adcd64d0fbf11c3c158576bdd.pdf
    • https://static.usrfiles.com/ugd/5899d5_52f39bbebb1144a9a57318ef018ec601.pdf
    • https://static.usrfiles.com/ugd/238140_b9648dbdf2e746a9b3b77b0a7570417c.pdf
    • https://static.usrfiles.com/ugd/b8c837_91436a01911e49eab3aeec83c749f18e.pdf
    • https://static.usrfiles.com/ugd/b8c837_4d47cced563b4c91b7c6e1833c6d57c7.pdf
    • https://static.usrfiles.com/ugd/b8c837_fcfb9e3be3f649bc813496de8b74e824.pdf
    • https://static.usrfiles.com/ugd/b8c837_438e1362bc0744e18a14f7939ea4c637.pdf
    • https://static.usrfiles.com/ugd/b8c837_9d6ac805ccef4705aeed88c6bf67e36f.pdf
    • https://static.usrfiles.com/ugd/8b9728_0406214c488c413095340921a94945f6.pdf
    • https://static.usrfiles.com/ugd/a2d007_f0bfeab6eb6e4eb8806544b43084a999.pdf
    • https://static.usrfiles.com/ugd/b8c837_f71d7067b8c44dc19fc0fc4162e34183.pdf
    • https://static.usrfiles.com/ugd/b8c837_57ce9fba7b8f487da62bb35dc16ce0a2.pdf
    • https://static.usrfiles.com/ugd/96768c_e1d41cac7a424443ace968cb93f7969a.pdf
    • https://static.usrfiles.com/ugd/516793_98700ee1fb3842198cff7c9664d65c27.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_off00007364.bin
8d2c567999b05532880acb4023110328f4ba4e07dbeedbc8cbc719452d9fe04e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7364 5332 bytes
font_01_sfnt_off00008599.bin
65135e8562dc2cf6571bc63873d12932c178df8eb827839f01c14679d2094712		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8599 10700 bytes

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