Malicious PDF — malware analysis report

Static analysis result for SHA-256 98ae4b66a5922229…

MALICIOUS

PDF

37.3 KB Created: 2020-08-30 03:03:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 257028cdd8523db989c1b3b43f483b1a SHA-1: ee780045727af8219d12ac6a2c515853b01ed0b6 SHA-256: 98ae4b66a59222293a2b17a2f7de8c30b9c48818ca053ff5e59312a62c509453
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.club/wix?keyword=cado+cheque+selection'. This URL is presented within the document body, suggesting a lure to trick users into clicking it. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs, many hosted on Shopify. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, but the primary attack vector appears to be social engineering via a malicious link.

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.club/wix?keyword=cado+cheque+selection
    • https://cdn.shopify.com/s/files/1/0437/6444/9437/files/46854461264.pdf
    • https://cdn.shopify.com/s/files/1/0432/3423/0429/files/88270677845.pdf
    • https://cdn.shopify.com/s/files/1/0433/3728/5797/files/midipegakajunenorulutosen.pdf
    • https://cdn.shopify.com/s/files/1/0429/8987/9445/files/baahubali_1_songs_naa_songs.pdf
    • https://cdn.shopify.com/s/files/1/0429/4007/2092/files/kohl_s_luxury_collection_sheets_discontinued.pdf
    • https://cdn.shopify.com/s/files/1/0433/8850/2174/files/73248682415.pdf
    • https://cdn.shopify.com/s/files/1/0432/6473/7448/files/nba_2k_13_xbox_360.pdf
    • https://cdn.shopify.com/s/files/1/0428/5172/9567/files/rise_of_the_witch_king.pdf
    • https://cdn.shopify.com/s/files/1/0433/6097/7048/files/bukewakenakapebizawagi.pdf
    • https://static.usrfiles.com/ugd/b8c837_21299698ec9846c19e961adc3ac3e058.pdf
    • https://static.usrfiles.com/ugd/b8c837_4d2c3bb36f12404e811aa3ac48835d09.pdf
    • https://static.usrfiles.com/ugd/764aaa_3e20fe072ccc410c9b4e558398d13076.pdf
    • https://cdn.shopify.com/s/files/1/0430/9411/4465/files/25228235956.pdf
    • https://cdn.shopify.com/s/files/1/0432/8030/2238/files/memogunox.pdf
    • https://cdn.shopify.com/s/files/1/0431/6128/8868/files/pabulopunisegib.pdf
    • https://cdn.shopify.com/s/files/1/0434/5095/7974/files/xasobo.pdf
    • https://cdn.shopify.com/s/files/1/0439/6518/6206/files/51991017333.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_off0000549e.bin
13a23106852b93f3e52d5df00847173224a6288cd8243f53e629847bfd116a75		 pdf-font-stream PDF embedded font (sfnt) at offset 0x549E 4964 bytes
font_01_sfnt_off00006575.bin
7bcc7d0b0ba44a168f40a3ab0e86a447e0032df29596293d3c679aca2ceb5cfd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6575 10396 bytes

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