Malicious PDF — malware analysis report

Static analysis result for SHA-256 536c137e746f0238…

MALICIOUS

PDF

41.9 KB Created: 2020-08-29 07:04:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 09fd68efd4321e7496cfda4b8984d497 SHA-1: d32b06127acd5fa24968fa9f1a8fecb608c91982 SHA-256: 536c137e746f02387a71e1bdf467310c8ac86c4fa4ea9825a4d6a41ac41f9472
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, a technique often used in SEO poisoning attacks to drive traffic to malicious sites. One of the primary links points to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body itself appears to be obfuscated or corrupted, but the presence of the malicious URL is the primary indicator of compromise.

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/wix?keyword=r2d2+interactive+astromech+droid+ins
    • https://static.usrfiles.com/ugd/b8c837_dac20c1629db4edea42acf905b7e44bf.pdf
    • https://static.usrfiles.com/ugd/b8c837_05ac857d6e664b3b910f3edfe205fdd3.pdf
    • https://static.usrfiles.com/ugd/b8c837_5e56721aa8f24c2f970c8bc7b0ce39b6.pdf
    • https://static.usrfiles.com/ugd/b8c837_98354f1194a24134a6492c032af1aa61.pdf
    • https://static.usrfiles.com/ugd/b8c837_fbcd355dca4b453e893ae47c2ec72677.pdf
    • https://static.usrfiles.com/ugd/b8c837_5097ae9a06ab421aaeccb800d9fed630.pdf
    • https://static.usrfiles.com/ugd/b8c837_9a8115d787d74a518af13af3cde225b7.pdf
    • https://static.usrfiles.com/ugd/b8c837_d542515fd38342aebb0df5f539d64902.pdf
    • https://static.usrfiles.com/ugd/b8c837_ff964ecc5c6241fba6fa20a46507a5d5.pdf
    • https://static.usrfiles.com/ugd/b8c837_b10f1ca66d2d46b0a9a5e89f3e9c9169.pdf
    • https://static.usrfiles.com/ugd/b8c837_fded61b4a0f74705b95d29c1c5064f73.pdf
    • https://static.usrfiles.com/ugd/b8c837_99708c189bd14f61846832929278c864.pdf
    • https://static.usrfiles.com/ugd/b8c837_a68c19e79ac14cc0a1bd0bc883cb7970.pdf
    • https://static.usrfiles.com/ugd/b8c837_d48435bfcd7b44a39adc667ed6fe7f03.pdf
    • https://static.usrfiles.com/ugd/b8c837_245bad349bc14776b5151a5e181ce681.pdf
    • https://static.usrfiles.com/ugd/b8c837_caba378897434a4e9a4c7be3dabc2fbf.pdf
    • https://static.usrfiles.com/ugd/b8c837_20e37c5d833c42aeb7bbb095db66a8da.pdf
    • https://static.usrfiles.com/ugd/b8c837_e3dcb6f9f96d49f39e6506ed47859c05.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_off000064e0.bin
c359499ccbab95589ef8551b2c18b134906f392d1902823d933d992be7f14a0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64E0 5344 bytes
font_01_sfnt_off000076dd.bin
426ac201fbfcd68ecd9f7b7ea2aa542682a1b97e5e4cb877fb4ae4ce21e327a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76DD 10472 bytes

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