Malicious PDF — malware analysis report

Static analysis result for SHA-256 72bdc72d74022f95…

MALICIOUS

PDF

53.6 KB Created: 2020-08-31 12:47:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aa946a2668d0a10a79107aff139dfa08 SHA-1: 67d8975bb5c385762798f0efd4a629c39810f41a SHA-256: 72bdc72d74022f956518ca82a588d726a785a66110f1a1918a18a581d62b2872
154 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, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body also contains the same URL, suggesting an attempt to trick users into downloading a file. The ML classifier strongly supports the malicious verdict.

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.ru/wix?keyword=espresso+coffee+the+science+of+quality+pdf+download
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_d92dd37c3518400786591cc6da3b1405.pdf
    • https://static.usrfiles.com/ugd/4d400c_91f4228e3d094a45b54a8364e8ea1319.pdf
    • https://static.usrfiles.com/ugd/b8c837_80af681399124cbe9b894ce3f21d82c8.pdf
    • https://static.usrfiles.com/ugd/e8506d_8328a93dd4154d2b959a8fdd35f33150.pdf
    • https://static.usrfiles.com/ugd/ea2f88_6132da5b32ce4947bbc9c7cdffda886e.pdf
    • https://cdn.shopify.com/s/files/1/0431/8973/1479/files/wituzeve.pdf
    • https://cdn.shopify.com/s/files/1/0430/9535/9641/files/68936083209.pdf
    • https://cdn.shopify.com/s/files/1/0432/9934/0448/files/83222716142.pdf
    • https://cdn.shopify.com/s/files/1/0430/4951/7205/files/html_editor_apk_uptodown.pdf
    • https://cdn.shopify.com/s/files/1/0431/5031/1579/files/paforas.pdf
    • https://cdn.shopify.com/s/files/1/0435/8474/9729/files/.pdf
    • https://cdn.shopify.com/s/files/1/0434/3883/3816/files/56196408592.pdf
    • https://static.usrfiles.com/ugd/a467d2_1d4b1e3cab2748a9b8f43a0b64ee58ee.pdf
    • https://static.usrfiles.com/ugd/4e6dd5_a7c2deb4db7f481eb169da1d0d87dd0c.pdf
    • https://static.usrfiles.com/ugd/e6092c_269aca38ca014934afaac3073954464a.pdf
    • https://static.usrfiles.com/ugd/efb3f0_44eb714700db44c9909979c16131f94b.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0000acbb.bin
b81e7a0e6861ab9b26eb1a9cea97f81997320e31df6015b9655cc591e240fb77		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xACBB 18184 bytes
font_00_sfnt_off0000752a.bin
d0789a69672d0d59d9ac4d70493497945b46973892821a6a17b8f47dcaa0bdd6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x752A 5520 bytes
font_01_sfnt_off00008800.bin
42bcc866f2fabd0c868eeef0821aae68832abfa7e243a28db95c8da3e26de7d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8800 10704 bytes

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