Malicious PDF — malware analysis report

Static analysis result for SHA-256 e97311b986d61c9b…

MALICIOUS

PDF

44.4 KB Created: 2020-08-31 05:23:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 321db87c0b42fb9f9554668c98ad284d SHA-1: fbb56babd45a4c4edc328de54c776480eef7bd67 SHA-256: e97311b986d61c9b766fc1113955bc0ead109b090fa0e94b749ea6079b39acc8
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by an ML classifier and contains a significant number of embedded links. One of these links, 'https://ttraff.com/wix?keyword=cuadrado+con+circulo+circunscrito+de', points to a known malicious redirector. The document body, though heavily obfuscated, also contains this URL and numerous other links to static.usrfiles.com, suggesting a link farm designed to distribute malicious content or phish users.

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=cuadrado+con+circulo+circunscrito+de
    • https://static.usrfiles.com/ugd/b8c837_3fb184f1e6c64fce87677d71e045335f.pdf
    • https://static.usrfiles.com/ugd/b8c837_43597533810547daa7ba4c2ad732d0a5.pdf
    • https://static.usrfiles.com/ugd/b8c837_db3c08653dbf460793325522e1576ce8.pdf
    • https://static.usrfiles.com/ugd/19ce5d_68a994164ff74451bce3316ddc694e67.pdf
    • https://static.usrfiles.com/ugd/1c8c6c_a69af4eb24d64a49a86b72ea99939284.pdf
    • https://static.usrfiles.com/ugd/628a76_c04e21fd9363410eb8a6185f21ff4cd3.pdf
    • https://static.usrfiles.com/ugd/9b33c5_b2d065a009c24444b58a001268564336.pdf
    • https://static.usrfiles.com/ugd/9cc572_417f08a3637543b3b1e79251028b4570.pdf
    • https://static.usrfiles.com/ugd/32777b_7869d847c29145fbad52ca4ebc2358b9.pdf
    • https://static.usrfiles.com/ugd/b4f0c6_509fee88b19e4acf84f9ae74d592ed4d.pdf
    • https://static.usrfiles.com/ugd/625844_8fabd2b004be4203bdc04c933b6aaf63.pdf
    • https://static.usrfiles.com/ugd/7ff653_ab4f8a3baab043dfb4032c5e12c23b7e.pdf
    • https://cdn.shopify.com/s/files/1/0436/1158/6722/files/bluetooth_software_for_android_apk.pdf
    • https://cdn.shopify.com/s/files/1/0433/3443/4969/files/field_controlled_dc_motor_transfer_function.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/11085861466.pdf
    • https://cdn.shopify.com/s/files/1/0435/1960/6936/files/lobixa.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000056d1.bin
8e11d87253c956b4c584e22042cbb3f401f483b3d2ecaf824e630495e1744fd7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x56D1 4836 bytes
font_01_sfnt_off00006745.bin
04fc66479cae86859a76ada5eecd5e5e5c1194bdcf642e7058b374018e36afe8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6745 11840 bytes
font_02_sfnt_off00008db8.bin
062f8a7185608a18dbd56baf48eb14c791e3c6ea8866a2ddd6a03467109098f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8DB8 16072 bytes

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