Malicious PDF — malware analysis report

Static analysis result for SHA-256 75fe6297398d5d14…

MALICIOUS

PDF

40.6 KB Created: 2020-09-10 07:31:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 03daf038b1cc772755e27bb23e2ece6c SHA-1: 5359c2fc0dced6710caf7cb204c15cd2fea319bf SHA-256: 75fe6297398d5d148b05e8962edc03ce04adaf8784b0a676f8b992be1b88f1e0
154 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to a known malicious URL, identified as a redirector. The document body, though heavily obfuscated, contains text related to PDF watermarking and the malicious URL, suggesting a lure to trick users into visiting the site. The presence of numerous external links, many pointing to benign PDFs, is characteristic of SEO spam or link farms used to distribute 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.ru/wb?keyword=add%20image%20watermark%20to%20pdf%20online%20free
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_95eeb68320074b9591d5225da0a34793.pdf
    • https://static.usrfiles.com/ugd/d90490_cb1017135b2b4ad28c03729632de1872.pdf
    • https://static.usrfiles.com/ugd/1e8759_eeccb671e33b4e4c966b7ac2fa6c680a.pdf
    • https://static.usrfiles.com/ugd/b8c837_e59049d69c4b45eb975085bc52814b9f.pdf
    • https://cdn.shopify.com/s/files/1/0430/4686/3005/files/76687556389.pdf
    • https://cdn.shopify.com/s/files/1/0427/3831/9527/files/49569824036.pdf
    • https://cdn.shopify.com/s/files/1/0438/6825/8469/files/ocean_animal_word_search_answers.pdf
    • https://static.usrfiles.com/ugd/b52961_d317cc78603e4c2cb38348bdd29abe23.pdf
    • https://static.usrfiles.com/ugd/3bca44_bb75f1570a5a4088a2c7298f878a1f86.pdf
    • https://static.usrfiles.com/ugd/bd1fc0_ced622c0c6cc40e4a7703abf47b5baa3.pdf
    • https://static.usrfiles.com/ugd/696117_ad0d11f89ce44529a1284662ecacec27.pdf
    • https://static.usrfiles.com/ugd/3f80ec_5bb7ffc2a6b245298108cb728059843e.pdf
    • https://static.usrfiles.com/ugd/defcb2_64e005f282a54543859cbd32b5679dff.pdf
    • https://static.usrfiles.com/ugd/55f640_797e426c6ed641e19230cd9f7519c92e.pdf
    • https://static.usrfiles.com/ugd/2c7c49_07afb529a4f140f0a221080542597979.pdf
    • https://static.usrfiles.com/ugd/b8c837_292e57e6f54449f19591ea43a18221a3.pdf
    • https://static.usrfiles.com/ugd/dbbfd0_e2275654bc6d4177ba9ca9784ddfcc04.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_off0000610f.bin
c0ea265e066ce4651606def778b5f9bb6f6c47de5c168cc3182435e459b24654		 pdf-font-stream PDF embedded font (sfnt) at offset 0x610F 5328 bytes
font_01_sfnt_off0000732d.bin
4eccda7f8538ae5a3da70b155ec4f03b6f6416807269a4ac6a121d956867fbad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x732D 10008 bytes

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