Malicious PDF — malware analysis report

Static analysis result for SHA-256 e492f634afe7c745…

MALICIOUS

PDF

44.7 KB Created: 2020-08-06 13:51:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 233b21f941c7ba913d62e2efec716d5b SHA-1: 0b69bada2ccd6c4f59085d699ff01cbef3df04ef SHA-256: e492f634afe7c745e0f44c8356aaeda05b5abae9158518e30fe3027aeec04367
154 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a critical heuristic firing indicating a malicious redirector link to 'ttraff.com'. The document body, though heavily obfuscated, also contains this URL and numerous other links hosted on Shopify and other domains, suggesting a link farm or redirection strategy. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to lead users to harmful 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.com/pify?keyword=designing+audio+power+amplifiers+2nd+edition+pdf
    • http://lorogu.fsgny.com/uploads/1/3/2/7/132740541/fe32d2547ab70.pdf
    • http://files.sugarhighllc.com/uploads/1/3/0/9/130969469/bokaji_bowejili.pdf
    • http://files.holmepierreponthall.com/uploads/1/3/1/3/131383207/6861697.pdf
    • https://cdn.shopify.com/s/files/1/0432/8764/2267/files/zenekoresuvedodo.pdf
    • https://cdn.shopify.com/s/files/1/0431/5702/9018/files/2008_odyssey_service_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/3332/9817/files/wibarevi.pdf
    • https://cdn.shopify.com/s/files/1/0429/0979/4463/files/pefekikupig.pdf
    • https://cdn.shopify.com/s/files/1/0434/6393/4109/files/fumuxi.pdf
    • https://cdn.shopify.com/s/files/1/0436/3013/3406/files/pitawuteseni.pdf
    • https://cdn.shopify.com/s/files/1/0431/2583/3882/files/4271836935.pdf
    • https://cdn.shopify.com/s/files/1/0433/7916/3285/files/91593981589.pdf
    • https://cdn.shopify.com/s/files/1/0431/2521/1296/files/97530812238.pdf
    • https://cdn.shopify.com/s/files/1/0428/7230/7875/files/vesuviwedawanonelomalefe.pdf
    • https://cdn.shopify.com/s/files/1/0429/9164/8929/files/kemonagunej.pdf
    • https://cdn.shopify.com/s/files/1/0438/0337/7824/files/hungarian_method_solving_assignment_problem.pdf
    • https://cdn.shopify.com/s/files/1/0438/2395/6125/files/81977874829.pdf
    • https://cdn.shopify.com/s/files/1/0428/2092/7644/files/gaxifelel.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_off00006ec5.bin
95bd3bdce926f1e6450c00987dc5a1f33f148f205e5ecc166ea8f7cbe1beb634		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EC5 5584 bytes
font_01_sfnt_off000081ca.bin
dc8f709c7c9367893c169adea42e17e6bb68c8e872a10e1b8280c6d972e8dc93		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81CA 10412 bytes

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