Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e757d4bb845c4ce…

MALICIOUS

PDF

42.9 KB Created: 2020-08-31 09:39:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a6f6bc99c6bfecf15913439838bdce60 SHA-1: 2528c895ae01fea568cfb4aa338ea529d10cc82f SHA-256: 7e757d4bb845c4ce0437c1fcb922966041fdbf1c97a8cd3c7218316953404e81
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link that redirects to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body and embedded links suggest a lure to download further content, likely a payload. 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.com/wix?keyword=classroom+object+worksheet+for+kinde
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0429/1526/6713/files/devibezekivafagamozed.pdf
    • https://cdn.shopify.com/s/files/1/0433/8984/5671/files/skeletal_wyverns_osrs.pdf
    • https://cdn.shopify.com/s/files/1/0431/1141/5962/files/xibamazeximovop.pdf
    • https://cdn.shopify.com/s/files/1/0432/8597/1110/files/majowazuw.pdf
    • https://cdn.shopify.com/s/files/1/0433/8342/3126/files/21685667498.pdf
    • https://static.usrfiles.com/ugd/1f5cef_fef125d442444cd8a4c3bc131382c528.pdf
    • https://static.usrfiles.com/ugd/e3c460_73513bef8e7e4ca0819c403b00e17f6a.pdf
    • https://static.usrfiles.com/ugd/b8c837_43733c1196504b1db6c4a34a0a534cd8.pdf
    • https://static.usrfiles.com/ugd/74a852_ed751946e2994f3abb5c7934ad05de0c.pdf
    • https://static.usrfiles.com/ugd/e33828_369796b2d809494cb12aa7a133b1df19.pdf
    • https://static.usrfiles.com/ugd/33a16d_7abbbde469b84226993fc1e9c7c05a37.pdf
    • https://static.usrfiles.com/ugd/b8c837_81b48788db024d088584af02255238f5.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005ad8.bin
0a53479c7c95f2e0265663fdbe5ffed5e2fa2d2f6b7ac3f266dce28edc7df248
pdf-font-stream PDF embedded font (sfnt) at offset 0x5AD8 5444 bytes
font_01_sfnt_off00006d46.bin
1a93b5a7fbe1765665810674f60da3cdbcf5cf3713ccb74292b6c6eda00b68b8
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D46 10364 bytes
font_02_sfnt_off000090c5.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378
pdf-font-stream PDF embedded font (sfnt) at offset 0x90C5 4324 bytes