Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1edd502956c333a…

MALICIOUS

PDF

47.4 KB Created: 2020-08-10 02:50:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e21b4001cb7f68aa156c01227116b193 SHA-1: 9d6f5ac946c5abb1ba542b85647d4a6a86b42894 SHA-256: a1edd502956c333a8acab971e7c2ff6bf4e34900a6fe27441856294606470c8d
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a known malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the URL that triggers the redirection. The PDF_SEO_LINK_FARM heuristic indicates a large number of outbound links, suggesting a tactic to distribute malicious content or engage in SEO manipulation. The ML classifier also strongly flagged this PDF as malicious.

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/pify?keyword=nietzsche+beyond+good+and+evil+walter+kaufmann+pdf
    • http://files.sdadata.org/uploads/1/3/1/4/131406849/domiwatu.pdf
    • http://files.accomplishedteachingny.org/uploads/1/3/1/4/131453465/2143170.pdf
    • http://files.ntsenthlothainternationalministries.com/uploads/1/3/2/7/132710694/e6e7ff39bd13.pdf
    • https://cdn.shopify.com/s/files/1/0450/9057/0405/files/faux_calligraphy_practice_sheets.pdf
    • https://cdn.shopify.com/s/files/1/0431/4667/4336/files/fundamentals_of_engineering_economics_second_edition.pdf
    • https://cdn.shopify.com/s/files/1/0439/8202/8958/files/38719635333.pdf
    • https://cdn.shopify.com/s/files/1/0429/9161/6153/files/61436434652.pdf
    • https://cdn.shopify.com/s/files/1/0431/9179/5873/files/tezirububamudozosu.pdf
    • https://cdn.shopify.com/s/files/1/0432/0814/7112/files/xovipebedosikexojarekuno.pdf
    • https://cdn.shopify.com/s/files/1/0436/3000/2336/files/free_abc_coloring_book.pdf
    • https://cdn.shopify.com/s/files/1/0428/1237/5207/files/korurebixosodoxunafo.pdf
    • https://cdn.shopify.com/s/files/1/0432/2885/6487/files/asymptotic_freedom.pdf
    • https://cdn.shopify.com/s/files/1/0433/9063/2101/files/33669353518.pdf
    • https://cdn.shopify.com/s/files/1/0437/6113/9861/files/78_camaro_z28.pdf
    • https://cdn.shopify.com/s/files/1/0430/6845/7113/files/84894193930.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_off000076f1.bin
395e469672477faf1db3623e75a6ed6a93c61a42ee172f40908baa3b0fdae7e2
pdf-font-stream PDF embedded font (sfnt) at offset 0x76F1 6044 bytes
font_01_sfnt_off00008b84.bin
b2deeb16a1d58e71af81dd34bd95efe62c3a86e96724df2f0a107b64653179ff
pdf-font-stream PDF embedded font (sfnt) at offset 0x8B84 10196 bytes