Malicious PDF — malware analysis report

Static analysis result for SHA-256 617f8450ab9d5ee2…

MALICIOUS

PDF

41.0 KB Created: 2020-08-30 07:11:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9cc62d7f97418fb162906a629ff09fdc SHA-1: b0aead6fca02bf9a18ddad9106f2fafe5e59978b SHA-256: 617f8450ab9d5ee26141d59bee2d158ac0b6cd4ab67b0128c4bb34875b19e203
162 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which points to a known malicious redirector. The document body text and heuristics suggest a lure to download content, likely to initiate further malicious activity. The presence of numerous external PDF links, many hosted on Shopify, indicates a link farm strategy to obscure the ultimate destination.

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.cc/wix?keyword=sound+enhancer+free
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/2563/6248/files/64885173934.pdf
    • https://cdn.shopify.com/s/files/1/0432/3583/6059/files/jolejo.pdf
    • https://cdn.shopify.com/s/files/1/0437/1863/9765/files/currency_symbols_with_name.pdf
    • https://cdn.shopify.com/s/files/1/0438/1881/1552/files/gorifuloginiduriraziz.pdf
    • https://cdn.shopify.com/s/files/1/0431/9812/0094/files/xixurob.pdf
    • https://static.usrfiles.com/ugd/b8c837_2d453f29562f478f9de2db5135a578fe.pdf
    • https://static.usrfiles.com/ugd/e2c250_b4916b0a92854218a459ece5efca33c3.pdf
    • https://static.usrfiles.com/ugd/df4650_5747e5865f5040198be0e1d46bd5f34a.pdf
    • https://static.usrfiles.com/ugd/2ac701_25224fe7c3e0406c877fba83f4d06d69.pdf
    • https://static.usrfiles.com/ugd/b8c837_6f7f3190808d45b599d585a6502508f3.pdf
    • https://cdn.shopify.com/s/files/1/0434/2412/0984/files/getegusodufu.pdf
    • https://cdn.shopify.com/s/files/1/0437/3096/0549/files/zupisotokupugalesazuwal.pdf
    • https://cdn.shopify.com/s/files/1/0435/4693/5451/files/33901175534.pdf
    • https://cdn.shopify.com/s/files/1/0459/2356/5717/files/94522763666.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zitadeduwifugegumav.pdf
    • https://cdn.shopify.com/s/files/1/0427/9785/8972/files/14752156732.pdf
    • https://cdn.shopify.com/s/files/1/0430/8343/2096/files/britannica_encyclopedia_2020_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0459/2061/6599/files/vpn_sonicwall_android.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_off000063a7.bin
43e11dbba05364e9dfafc2d45cdb0617a1e0549e0a6ca2b0d6d26b39ab4ba8bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63A7 5004 bytes
font_01_sfnt_off00007499.bin
2e569b1cc9b29667f59b1fbada0d3d4c56f1510acb9131008aaa0bcaeb366ff9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7499 10128 bytes

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