Malicious PDF — malware analysis report

Static analysis result for SHA-256 34882b23afaeffd3…

MALICIOUS

PDF

36.0 KB Created: 2020-08-31 03:46:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1b307bbcfc4eb50e7022984c892adc8d SHA-1: c380ee2e6082bcd382e174480528c669001cbeb8 SHA-256: 34882b23afaeffd3083529c3e68618b3e13e5c652750025e44f2f1570573f67f
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.ru, disguised as a chemistry worksheet answer key. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms this, and the ML classifier strongly supports the malicious nature of the document. The document body, though heavily obfuscated, contains the URL and appears to be a lure for educational content.

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.ru/wix?keyword=chemistry+worksheet+1+mass-mass+problems+answers
    • https://static.usrfiles.com/ugd/eed56f_895c4eee23b14c64bd61de7145e4d04f.pdf
    • https://static.usrfiles.com/ugd/9b33c5_dc26e4c91ddf4f50b14dec5b37de746b.pdf
    • https://static.usrfiles.com/ugd/5b5da7_4064ac5015e44d91b46ee015f484f9a8.pdf
    • https://static.usrfiles.com/ugd/ea2f88_5aea4387ab3a4120b6ae5ffda526d9e0.pdf
    • https://static.usrfiles.com/ugd/b8c837_455f551428b740809a72f88b29ea7ddc.pdf
    • https://cdn.shopify.com/s/files/1/0430/0773/8019/files/rurisiwag.pdf
    • https://cdn.shopify.com/s/files/1/0431/8032/7076/files/31471666223.pdf
    • https://cdn.shopify.com/s/files/1/0430/6308/3162/files/dinosetumisefi.pdf
    • https://cdn.shopify.com/s/files/1/0433/8630/6710/files/52096646673.pdf
    • https://cdn.shopify.com/s/files/1/0440/2230/0822/files/6625538686.pdf
    • https://cdn.shopify.com/s/files/1/0431/8475/0747/files/mortgage_apr_calculator_excel_spreadsheet.pdf
    • https://cdn.shopify.com/s/files/1/0439/0898/9096/files/43928265574.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_off00004f1b.bin
97843500040c70f96a5a2b6967cdb32550c7685ec8fbb4d91d4ad3c3fa50902f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4F1B 5448 bytes
font_01_sfnt_off00006196.bin
0c7eaf9067b3eb9e7dcd6aafff01e63b2b171b93a4b42025adca1dc9e6b8a17a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6196 9788 bytes

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