Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff879144c624907c…

MALICIOUS

PDF

39.5 KB Created: 2020-08-18 16:15:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a3aafb586c1e386af5ded174e8eb3b94 SHA-1: c34677828427cba660b05c6f80173cc7e54031c7 SHA-256: ff879144c624907c27c5b6f2941aac0baac88f231a96f40b200808a40c6aed63
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple critical heuristics for containing malicious redirector links and a large number of external PDF links, suggesting a link farm or SEO manipulation tactic. One of the embedded URLs, https://ttraff.ru/pify?keyword=formation+basalte+et+gabbro, is identified as a malicious redirector. The document body is heavily obfuscated and contains this same URL, indicating it is the primary lure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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/pify?keyword=formation+basalte+et+gabbro
    • http://files.pineridgewaterdistrict.com/uploads/1/3/0/7/130776272/7225819.pdf
    • https://cdn.shopify.com/s/files/1/0427/8134/3900/files/vpn_indonesia_pro_apk.pdf
    • https://cdn.shopify.com/s/files/1/0434/0069/1868/files/95966469445.pdf
    • https://cdn.shopify.com/s/files/1/0429/4764/1511/files/5460053921.pdf
    • https://cdn.shopify.com/s/files/1/0437/6097/6021/files/26476871709.pdf
    • https://cdn.shopify.com/s/files/1/0430/9522/8565/files/wivosuw.pdf
    • https://cdn.shopify.com/s/files/1/0434/3057/6278/files/kosuromesuni.pdf
    • https://cdn.shopify.com/s/files/1/0432/2616/9503/files/cookie_clicker_bot.pdf
    • https://cdn.shopify.com/s/files/1/0431/4241/4492/files/bojukitegarun.pdf
    • https://cdn.shopify.com/s/files/1/0431/6066/6274/files/23905364816.pdf
    • https://cdn.shopify.com/s/files/1/0435/9149/9935/files/94315782019.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005929.bin
35d883a7445fca5e83dbcf39f16c7ed5f988da6127385cda1465cb9aa1d92996		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5929 5100 bytes
font_01_sfnt_off00006a67.bin
a96f4d59108577c266df61d41eaa4d953051afe6d18acb73e369f6ba9cbbe689		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A67 11944 bytes

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