Malicious PDF — malware analysis report

Static analysis result for SHA-256 161fb757d78f9a7f…

MALICIOUS

PDF

43.8 KB Created: 2020-08-31 14:51:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c109a280aacb630954b6aa8e4e3b3769 SHA-1: 6f634390d3071c3c04345d4f8cd68f32f36dc8d9 SHA-256: 161fb757d78f9a7f95fdaf09d26d729efcb28de29900b798b7d6058c7eb850a7
162 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a known malicious URL, disguised as an employment application. The PDF also hosts a large number of links to other PDFs, likely for SEO manipulation or to obscure the malicious redirect. The ML classifier strongly indicates maliciousness.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=application+form+for+employment+mes+ng+staff
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0433/3636/8296/files/lubulanojabotux.pdf
    • https://cdn.shopify.com/s/files/1/0434/4614/1093/files/lemme_d_ito.pdf
    • https://cdn.shopify.com/s/files/1/0439/8150/4670/files/weiss_chaconne_guitar.pdf
    • https://static.usrfiles.com/ugd/585b1d_5efcefa26cff40579c0ff8851c037f18.pdf
    • https://static.usrfiles.com/ugd/20d83a_2b50d958c25344839d119cae3be28671.pdf
    • https://cdn.shopify.com/s/files/1/0431/3976/0295/files/darutikokodifof.pdf
    • https://cdn.shopify.com/s/files/1/0429/9885/7891/files/zupakogaj.pdf
    • https://cdn.shopify.com/s/files/1/0464/1603/6008/files/burger_bistro_montana_menu.pdf
    • https://cdn.shopify.com/s/files/1/0438/0426/2561/files/american_english_file_5_teacher_s_book.pdf
    • https://cdn.shopify.com/s/files/1/0429/4351/2732/files/bangsamoro_history.pdf
    • https://static.usrfiles.com/ugd/32777b_2a65d55daf454bf582f4bdf9865d142f.pdf
    • https://static.usrfiles.com/ugd/b8c837_51de7105e05e4e798e6da468956b3eb4.pdf
    • https://static.usrfiles.com/ugd/917232_291e6013a671410a91fdb5222a85559f.pdf
    • https://static.usrfiles.com/ugd/b8c837_55c95d7425094209b1bd0b0057209363.pdf
    • https://static.usrfiles.com/ugd/c63dba_8809e12c99d94557a640305665354df9.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f83.bin
acc4ab8676c2ee898e75a9c471ccab5f9e5d829a63c04ff83d6e8ff8d2e95e99		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F83 5216 bytes
font_01_sfnt_off00007120.bin
6c4910764d9afc3e3247ef6b8eed129baffbd88766a4994d77a83ca9218a3df1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7120 10356 bytes
font_02_sfnt_off0000940b.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x940B 4324 bytes

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