Malicious PDF — malware analysis report

Static analysis result for SHA-256 24bed62a184cdfa1…

MALICIOUS

PDF

93.1 KB Created: 2020-09-08 15:58:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cf6c14983462ab8335a9673710005275 SHA-1: 0bf7f84e9da163491de1c1db5063f4c6b8a9e8b5 SHA-256: 24bed62a184cdfa10e91c198c8eaaa39ec51aa2ffcb5bb602a9b0c7a975988a1
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.001 PowerShell

The PDF file was identified as malicious by a machine learning classifier and contains a large number of embedded external links, many of which point to a redirector service. The primary malicious URL identified is https://ttraff.cc/wix?keyword=cerium+uses+and+information, which is likely used to funnel victims to further malicious content. The document body, though heavily obfuscated, also contains this URL, suggesting it is the intended lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.cc/wix?keyword=cerium+uses+and+information
    • https://static.usrfiles.com/ugd/b914b5_b7b0d33b6421414ea8cb6bbf38c9a741.pdf
    • https://static.usrfiles.com/ugd/f84671_e7e934c7f93f4926a2520275c89b27b6.pdf
    • https://static.usrfiles.com/ugd/a18aa6_43962ffe3ae04f5492df5117c3daa2d4.pdf
    • https://static.usrfiles.com/ugd/dad90e_6beed8e39a6a43848fb3d3f802a3f019.pdf
    • https://static.usrfiles.com/ugd/e7e4a0_7d23e656e3f94364b91111b5bfd65016.pdf
    • https://static.usrfiles.com/ugd/6f9b04_b880fd6af4634d219f75a974b034ff7f.pdf
    • https://static.usrfiles.com/ugd/0adedf_27248de8d1e1422fb8cdb971f0965c6b.pdf
    • https://static.usrfiles.com/ugd/0bfb20_bb28bfa2cbb34d69a4018a940589a7dc.pdf
    • https://static.usrfiles.com/ugd/3ed44c_b813ca0a99294c5b9a3f9dbd96ffeffe.pdf
    • https://static.usrfiles.com/ugd/79e5df_6fca6f5b045d4b4286650c8ceef37f60.pdf
    • https://cdn.shopify.com/s/files/1/0429/9161/6153/files/buduwutefa.pdf
    • https://cdn.shopify.com/s/files/1/0432/4222/5832/files/poxavuwemefogilezisixiso.pdf
    • https://cdn.shopify.com/s/files/1/0434/3175/5932/files/birla_sun_life_premium_receipt.pdf
    • https://cdn.shopify.com/s/files/1/0434/6665/3858/files/gedonepitibugen.pdf
    • https://cdn.shopify.com/s/files/1/0431/2940/5600/files/kadewibax.pdf
    • https://cdn.shopify.com/s/files/1/0435/6279/5171/files/26645926346.pdf
    • https://cdn.shopify.com/s/files/1/0429/6704/0163/files/waxelonasifovare.pdf
    • https://cdn.shopify.com/s/files/1/0437/6143/4773/files/ruvubazakopagula.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1f5.bin
d2077f5d6d5b1d677d9b6d000eb087611a047961d42ceeb980acba3b54af8b85		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F5 6492 bytes
font_01_sfnt_off0001022a.bin
37069a8fef1b2ba451ac6820ad24a0609251ef703aebef6b17a4266183b879e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1022A 4924 bytes
font_02_sfnt_off000112ca.bin
0e85bca6a5f9898223c77f417e3370bba64c9b0669fe467b126ef100fc23a34a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x112CA 15600 bytes
font_03_sfnt_off00014330.bin
c43c81af3addadc619f1b50b0eb79006c69e58cb90abf43f7a5fbd940e22698c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14330 16060 bytes
font_04_sfnt_off000157c4.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x157C4 4324 bytes

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