Malicious PDF — malware analysis report

Static analysis result for SHA-256 60e9558ad9fe44c0…

MALICIOUS

PDF

52.5 KB Created: 2020-09-02 12:42:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c6a8ff246887fdc3eea564baeb5ef570 SHA-1: f0ccbfe625be02391201779cf06dfb553505d8e4 SHA-256: 60e9558ad9fe44c0e674ef330d1ca31303c3ce38a9271565a7b7d2d75dc5259a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to a redirector URL known to be malicious. The document body, though heavily obfuscated, contains references to the malicious URL and appears to be a lure to encourage clicks. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

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=cyanogenmod+android+7
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/40b9e6_d38575d729d74af38fb6dee465fc398a.pdf
    • https://static.usrfiles.com/ugd/09273f_cd41635ce82f4e01a8bf937715e5ac8b.pdf
    • https://static.usrfiles.com/ugd/03ae60_8551f2ba53404c5baa8fd3a90d43b7bb.pdf
    • https://static.usrfiles.com/ugd/5cf23b_55dd8eddefe24745b1b7614efe2e82c5.pdf
    • https://static.usrfiles.com/ugd/b914b5_5d62df42f2854606817613d24620c500.pdf
    • https://static.usrfiles.com/ugd/34ec99_554595ac5ccd4c8891daa34627430129.pdf
    • https://static.usrfiles.com/ugd/e2c250_b94fff62366a4bdea63f65197552ebd1.pdf
    • https://static.usrfiles.com/ugd/b8c837_51daf907da9847f090bb1f03e0535f51.pdf
    • https://static.usrfiles.com/ugd/65e777_9109bf3205184d50b27168fb5f2fe52a.pdf
    • https://static.usrfiles.com/ugd/b8c837_91b65c4aed5c49e0b53f8eb71402cae4.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/44219577828.pdf
    • https://cdn.shopify.com/s/files/1/0437/4937/6149/files/convert_dataframe_to_list.pdf
    • https://static.usrfiles.com/ugd/3283b0_6ec174676ea74b8a8622b4a384a38f83.pdf
    • https://static.usrfiles.com/ugd/e3c460_7b17e0ca2b454fbdb7ff7d5bd6158df6.pdf
    • https://static.usrfiles.com/ugd/aa14a9_d5967776318347c9bf3a6db6353a297c.pdf
    • https://static.usrfiles.com/ugd/041b56_ab757bc0d77a4890911d7c77e0ac07e2.pdf
    • https://static.usrfiles.com/ugd/8ff694_a59d9ece34bc4c529e2824bb476455f1.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006765.bin
0868beb00b0300ac8ede7f645a599fd23dc892cd1ba793c5373f5a645400dbb9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6765 4848 bytes
font_01_sfnt_off000077ca.bin
8526018746e8cdd44e06a85757d81287ac8d985f94cea600dac0e997936737a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77CA 10396 bytes
font_02_sfnt_off00009ad2.bin
21aa825c25c52d1779e5e8a9fd0a8b7c1b3dd56c9b6150644649f3ccacd468d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9AD2 18080 bytes
font_03_sfnt_off0000b663.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB663 4324 bytes

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