Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dcd1208e2c0b20a…

MALICIOUS

PDF

41.7 KB Created: 2020-08-30 11:30:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dfc82e00188483dc1c28f3fb914783f2 SHA-1: c37aaa7e512dcac8080ca6b795a410ad402f84ba SHA-256: 5dcd1208e2c0b20a72aa71642afe303c508f626ae8c211c61e79922b8e163cd9
194 Risk Score

Malware Insights

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

The PDF contains a lure for a 'YouTube flv downloader' and embeds a link to a known malicious redirector. The heuristic 'SE_BROWSER_INSTALL_LURE' indicates the document's intent to trick the user into installing something, which is a common social-engineering tactic. The presence of numerous external PDF links, many pointing to benign content, suggests a link farm used to obscure the malicious redirector.

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.cc/wix?keyword=youtube+flv+downloader
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_5f19b026a2444fb8a703bc85c9544f80.pdf
    • https://static.usrfiles.com/ugd/dd4472_78604d19e2364927821941c919be78b2.pdf
    • https://static.usrfiles.com/ugd/0aab01_f47df72dbd144eec95ee14ba49bf060f.pdf
    • https://static.usrfiles.com/ugd/b8c837_b2886f69bb75408cb1042e9059225a6d.pdf
    • https://static.usrfiles.com/ugd/b8c837_d70c5c6f37024ce0901cfea14c0efcb7.pdf
    • https://cdn.shopify.com/s/files/1/0432/2010/7424/files/domenamuvotepopefepa.pdf
    • https://cdn.shopify.com/s/files/1/0428/4976/3494/files/48406431420.pdf
    • https://cdn.shopify.com/s/files/1/0461/0975/3507/files/53446512000.pdf
    • https://cdn.shopify.com/s/files/1/0431/6600/7445/files/java_jdk_older_version.pdf
    • https://cdn.shopify.com/s/files/1/0433/3748/2405/files/lopi_leyden_pellet_stove_wiring_diagram.pdf
    • https://cdn.shopify.com/s/files/1/0430/3483/7149/files/rojarebumekudepujus.pdf
    • https://static.usrfiles.com/ugd/b8c837_0c071499630f4da8a037e399882d5f86.pdf
    • https://static.usrfiles.com/ugd/57c819_cba75e8972ff4e1f9dffca030f01be9e.pdf
    • https://static.usrfiles.com/ugd/3aca14_3fb9553927e74eeaba9d8b640799275d.pdf
    • https://static.usrfiles.com/ugd/b8c837_114f6fa836b74e938d7a4e247ad61e08.pdf
    • https://static.usrfiles.com/ugd/b8c837_42c352870c6d464aa2ba5c4fa26692ff.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_off00006631.bin
acc57a4eaa83f07fe87cfaf0c1d172bfe059c2b41ac7588ec5d2f4b00aee0ed7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6631 4976 bytes
font_01_sfnt_off00007747.bin
6f6a865809df4759fd0d973f2f7018dffaf486139f36109b12bffe9056c31534		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7747 10132 bytes

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