Malicious PDF — malware analysis report

Static analysis result for SHA-256 372e0d99ced9ad2b…

MALICIOUS

PDF

35.6 KB Created: 2020-09-01 04:49:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 219e9ea86c87b4552f03ac71890daa35 SHA-1: 407e82f6683cbd5a5e0314b67b56f06c6dc61870 SHA-256: 372e0d99ced9ad2b9c01a7dd6dfbba18737a185e51ce3996668e6338fca4bba5
154 Risk Score

Malware Insights

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

The PDF document contains a clear lure, promising "Prescriptive test edgenuity answers english 3", and includes a malicious redirector link. The ML classifier strongly flagged this PDF as malicious, and heuristic rules confirm the presence of a malicious redirector and a link farm. The document body, though partially corrupted, contains the malicious URL.

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=prescriptive+test+edgenuity+answers+english+3
    • https://static.usrfiles.com/ugd/c5d40f_06098cd767694553bef5502e470a8d1d.pdf
    • https://static.usrfiles.com/ugd/7c30af_6a92ca6e6d3d4cef8e7d9cd1d7fd99a6.pdf
    • https://static.usrfiles.com/ugd/e3ff21_d98ae9ce05de425bb57a73b8eaff5bb4.pdf
    • https://static.usrfiles.com/ugd/b8c837_9c29b7e70c884c9f9c1d1b44e6d7cdb0.pdf
    • https://static.usrfiles.com/ugd/7d21c0_1426cbbdc1844f4781015a314f930dd2.pdf
    • https://static.usrfiles.com/ugd/b8c837_4dc0cfc814ab4fb38b66e5784fbee6c3.pdf
    • https://cdn.shopify.com/s/files/1/0440/5841/1158/files/auto_increment_sql.pdf
    • https://cdn.shopify.com/s/files/1/0437/7100/3037/files/wujobomupelawesonofogudu.pdf
    • https://cdn.shopify.com/s/files/1/0429/8155/6375/files/nivijoxubolom.pdf
    • https://cdn.shopify.com/s/files/1/0438/3349/1613/files/2_column_table_template_html.pdf
    • https://cdn.shopify.com/s/files/1/0431/5679/9647/files/kelley_blue_book_used_rv_values.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_off00004bfb.bin
abdd0eb1ccb778d94d280dd41bcba26d8f9a882b75f979538903d4bd6cb9053c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4BFB 5752 bytes
font_01_sfnt_off00005faa.bin
08c1cfb5548adc475077542158784f82f01c6b3faaef49406e630521bebe4874		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FAA 9888 bytes

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