Malicious PDF — malware analysis report

Static analysis result for SHA-256 17d182a70d1697be…

MALICIOUS

PDF

45.0 KB Created: 2020-09-05 04:31:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2b8505052e6b3c66346e10743703dacd SHA-1: c8b302abe55a967219343f8eb60bca6f3353d784 SHA-256: 17d182a70d1697bea2480f848739189042a54256678a45002ce393939592be49
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a critical heuristic firing for a malicious redirector link, which is further supported by a browser extension installation lure. The document body, though heavily obfuscated, contains the same redirector URL and several other URLs pointing to PDF files hosted on Shopify. This suggests a campaign to drive traffic to malicious sites, likely for malware distribution or phishing. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.link/wix?keyword=koplayer+android+emulator+for+pc+free
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/7502/7619/files/wabuxudelilebubo.pdf
    • https://cdn.shopify.com/s/files/1/0429/3849/9235/files/wojife.pdf
    • https://cdn.shopify.com/s/files/1/0430/4162/0119/files/epson_310_driver.pdf
    • https://cdn.shopify.com/s/files/1/0459/6210/0896/files/codificacion_del_derecho_administrativo.pdf
    • https://cdn.shopify.com/s/files/1/0434/7746/7288/files/xaribuzomuxemorigotim.pdf
    • https://cdn.shopify.com/s/files/1/0438/2811/7661/files/77853123.pdf
    • https://cdn.shopify.com/s/files/1/0439/4093/7896/files/corpus_christi_texas_crime_rate.pdf
    • https://cdn.shopify.com/s/files/1/0432/5762/6792/files/mekamunazujinimi.pdf
    • https://static.usrfiles.com/ugd/3bf302_eb6321ffa2e54720a5da317cc986f4bb.pdf
    • https://static.usrfiles.com/ugd/4bdc6d_b7954f530b034576892d5b2033905cad.pdf
    • https://static.usrfiles.com/ugd/17beed_16ab3299ab884946ab2958ae62b42ca6.pdf
    • https://static.usrfiles.com/ugd/b8c837_7f825cf65625495496c79e78b526030c.pdf
    • https://static.usrfiles.com/ugd/0d002d_12b219dd5c8e4d3fa2237ce41aafd32e.pdf
    • https://static.usrfiles.com/ugd/738632_fb9d4820311240d28b7c2c12fe77b36e.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007250.bin
c36b52cd6488e8d1ad2953cc61ff9de496c3d13a1e779c45705483b8d8d334ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7250 5192 bytes
font_01_sfnt_off000083f9.bin
27e1f68fa0ac8f09a40e59b04e46a1c66604aa3aeacffd026904c6ba38a19c32		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83F9 10196 bytes

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