Malicious PDF — malware analysis report

Static analysis result for SHA-256 665d7fbe276925c8…

MALICIOUS

PDF

42.4 KB Created: 2020-08-31 01:18:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f241863708d91c818da196615a493ef7 SHA-1: 42bb12ce5ea9c20ab60c40aab2c86f7db414f6a1 SHA-256: 665d7fbe276925c8d0f8686b01a50ca9d6535841c2e6fa0144c4d067781adf18
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm designed to redirect users to malicious infrastructure. The primary redirector URL identified is https://ttraff.ru/wix. The ML classifier strongly indicated maliciousness, and the PDF structure suggests an attempt to obscure the malicious intent through a link farm.

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=album45dotcom+patricia+montgomery+ma
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/7441/2949/files/jumiwolagirutirexivep.pdf
    • https://cdn.shopify.com/s/files/1/0440/8419/9574/files/phil_driscoll_songs.pdf
    • https://cdn.shopify.com/s/files/1/0464/0948/2408/files/baccho_ki_naat.pdf
    • https://cdn.shopify.com/s/files/1/0428/2544/9628/files/spotify_free_apk_old_version.pdf
    • https://cdn.shopify.com/s/files/1/0433/8617/5651/files/23818294948.pdf
    • https://static.usrfiles.com/ugd/b8c837_e3c088c13cb04a428c58dfef8b604f5f.pdf
    • https://static.usrfiles.com/ugd/3f80ec_39b86e7f291140b59e6af91641fb225a.pdf
    • https://static.usrfiles.com/ugd/e33828_a9d97f3775204fe199ec268840d6d2fa.pdf
    • https://static.usrfiles.com/ugd/a86d68_4c68a287576443ca96303fd1dd395a5f.pdf
    • https://static.usrfiles.com/ugd/eed56f_a9803597737b4ec19a1261d26621efc2.pdf
    • https://cdn.shopify.com/s/files/1/0434/0603/3063/files/wixabixukipuxurug.pdf
    • https://cdn.shopify.com/s/files/1/0430/4545/3985/files/dedudorolojire.pdf
    • https://cdn.shopify.com/s/files/1/0427/8157/3279/files/47382061436.pdf
    • https://cdn.shopify.com/s/files/1/0429/0550/1852/files/98370695882.pdf
    • https://static.usrfiles.com/ugd/b8c837_66dc8210f9214acfbe9ec9d284a283d5.pdf
    • https://static.usrfiles.com/ugd/0df15e_ebb87b2be2f2445d8fac31535731628a.pdf
    • https://static.usrfiles.com/ugd/b8c837_52a37e8d1e314e9bb3f4a603e9ed09b8.pdf
    • https://static.usrfiles.com/ugd/4b874d_6580adfa1fa846a18904d807c0bbd416.pdf
    • https://static.usrfiles.com/ugd/c0fca2_f5613cb8fc2b4afe8f35ca2f9d13d7d4.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_off00006630.bin
e0c7ddd2acb5f84448367b523b31bf520de2571c7e89476df2eaef92fb42c40b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6630 5660 bytes
font_01_sfnt_off00007964.bin
6773a34a444cc2e5474ba83114964f968e35cd38d6a14ff2f554b78d83f9552d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7964 10272 bytes

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