Malicious PDF — malware analysis report

Static analysis result for SHA-256 c721faf5e4383786…

MALICIOUS

PDF

44.7 KB Created: 2020-08-29 17:25:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 20e9e884709ed3f9e71bc9a5c2afb63d SHA-1: 6d0faf9803b51c9312a50e8f995b722849cf0aee SHA-256: c721faf5e4383786829b8e332f827fc9e90b94752e58dbbe3e964c3f8abc4bc7
154 Risk Score

Malware Insights

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

The PDF was flagged as malicious by a machine learning classifier and contains numerous embedded links. One critical heuristic identified a link to a known malicious redirector at 'https://ttraff.com/wix?keyword=comptia+ctt+study+guide'. Another heuristic noted a large number of external PDF links, with the first pointing to 'https://cdn.shopify.com/s/files/1/0430/4506/0762/files/646_604_9033.pdf'. The document body contains garbled text but includes the same URLs, suggesting a lure to external content. No scripts were extracted from this sample.

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.com/wix?keyword=comptia+ctt+study+guide
    • https://cdn.shopify.com/s/files/1/0430/4506/0762/files/646_604_9033.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mejamuzeditika.pdf
    • https://cdn.shopify.com/s/files/1/0437/8329/1029/files/candle_making_books.pdf
    • https://cdn.shopify.com/s/files/1/0433/3030/6203/files/95106511793.pdf
    • https://cdn.shopify.com/s/files/1/0433/5566/8639/files/maparus.pdf
    • https://cdn.shopify.com/s/files/1/0429/2814/4543/files/gitinokokujolunarerex.pdf
    • https://cdn.shopify.com/s/files/1/0432/1676/5088/files/26228552378.pdf
    • https://cdn.shopify.com/s/files/1/0437/7152/7325/files/74058019923.pdf
    • https://cdn.shopify.com/s/files/1/0437/8322/5506/files/39060616588.pdf
    • https://cdn.shopify.com/s/files/1/0428/0621/4819/files/71139126782.pdf
    • https://cdn.shopify.com/s/files/1/0430/7520/7322/files/danganronpa_chapter_1_guide.pdf
    • https://cdn.shopify.com/s/files/1/0432/5307/2022/files/xufepesasepori.pdf
    • https://static.usrfiles.com/ugd/b8c837_8853e814d99146798869e068d739845e.pdf
    • https://static.usrfiles.com/ugd/b8c837_e934b1eb7db94ee79e3b7e0d26bc9e27.pdf
    • https://static.usrfiles.com/ugd/b8c837_b01fc56c381f4779bf5c7aad3101d6d4.pdf
    • https://static.usrfiles.com/ugd/b8c837_8766446a74dd4406a44874d7c1faf0f0.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000613e.bin
cb65b91688216bfde6592e8d562cdb03fd31d476b140d473efd25629c2021164		 pdf-font-stream PDF embedded font (sfnt) at offset 0x613E 5168 bytes
font_01_sfnt_off000072e0.bin
47bdcf8d4c7f62de96d28f8aa76201c1172194ce3d2e17c6dfc66866d94d65bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72E0 10772 bytes
font_02_sfnt_off00009793.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9793 4324 bytes

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