Malicious PDF — malware analysis report

Static analysis result for SHA-256 116b17e98944a655…

MALICIOUS

PDF

35.3 KB Created: 2020-09-05 19:01:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6614e4d5f8a2a0bb75370e6f8f063a1e SHA-1: 388b6d1677a9b0363938f35c507be2653ee5a327 SHA-256: 116b17e98944a65543f8484f22c4a419e6e16468c1fdb832caaba9f4b4e09dfa
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, which is designed to lead users to further malicious content. The document body, though heavily obfuscated, contains the URL and appears to be a lure for a "textbook of medical biochemistry pdf". The presence of numerous external PDF links, many pointing to benign content, suggests a link farm or SEO poisoning tactic to increase the visibility of the malicious redirector. The ML classifier strongly indicates maliciousness.

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.club/wix?keyword=textbook+of+medical+biochemistry+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/fa32a6_8b1641a660bc47868c3acacab94627ef.pdf
    • https://static.usrfiles.com/ugd/607883_e2164b42249342a2a044b90ab6849922.pdf
    • https://static.usrfiles.com/ugd/fb5067_62b9ac3b6e0b45cf8c78a9733c3143d6.pdf
    • https://static.usrfiles.com/ugd/defcb2_3ea8df14a7614df6bc9ade4511f17049.pdf
    • https://static.usrfiles.com/ugd/40336e_bf5ebf47d2dc4cf68c704336d4daf3f0.pdf
    • https://static.usrfiles.com/ugd/cec570_c5bae21d39e2424eafefccb5c140febf.pdf
    • https://static.usrfiles.com/ugd/33c377_344d2fde2b2b42d0bc60db3a624bea70.pdf
    • https://static.usrfiles.com/ugd/f90bad_ea2b57559c084df09a8776af6a1269ba.pdf
    • https://static.usrfiles.com/ugd/5b9365_dde768163bdd4e7e9f71dd64d3086f44.pdf
    • https://static.usrfiles.com/ugd/451a43_9d0b0219fb924025a2d1770701204794.pdf
    • https://static.usrfiles.com/ugd/8127dd_7968f83b525d45a7996156120d5952e7.pdf
    • https://cdn.shopify.com/s/files/1/0434/4302/8120/files/wagitileziradigosivuliwo.pdf
    • https://cdn.shopify.com/s/files/1/0430/8906/8185/files/word_documents_to_converter_free.pdf
    • https://cdn.shopify.com/s/files/1/0438/4335/4781/files/bloqueadores_alfa_adrenergicos.pdf
    • https://cdn.shopify.com/s/files/1/0436/9930/6648/files/fesejibemana.pdf
    • https://cdn.shopify.com/s/files/1/0430/9758/7861/files/talorinuxosuniweb.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_off00004b86.bin
810fc480c08cf6775d5c5045297d41ebf7df489d89ea3c7beed98204978c80ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4B86 5720 bytes
font_01_sfnt_off00005ed6.bin
4398003b0c99ad7da3407f45a2f90a2244c1328ae6ec40a1b95b688f197b9602		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5ED6 10028 bytes

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