Malicious PDF — malware analysis report

Static analysis result for SHA-256 6836749f79f69e8e…

MALICIOUS

PDF

99.9 KB Created: 2020-08-29 21:10:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b226f346224e3ecf8e28dbfcfe4c9606 SHA-1: b3f152f911793bab5b6e1a9f35b1e6647ff937b4 SHA-256: 6836749f79f69e8ef296a936be47303cdc7c4d86eb20421b20205485ea15b6a3
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.link, which is designed to lead users to further malicious content. The document body, though heavily obfuscated, contains the same URL and keywords related to Android development, suggesting a lure to disguise the malicious intent. The ML classifier strongly flagged this PDF as malicious, and the presence of a link farm further supports malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.link/wix?keyword=android+application+framework+architecture
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_5eec4bbe028b4a24be489570cf5eb964.pdf
    • https://static.usrfiles.com/ugd/b8c837_114e5d7d0dcc4541a4bc9ba8b55104f5.pdf
    • https://static.usrfiles.com/ugd/930050_e0c42fea26884d378b5678a3200c9183.pdf
    • https://static.usrfiles.com/ugd/b8c837_6da60fc53bc84772bafbcda19175f603.pdf
    • https://cdn.shopify.com/s/files/1/0434/4017/7314/files/reading_files_c.pdf
    • https://cdn.shopify.com/s/files/1/0430/8297/3346/files/fazixidawijesazupi.pdf
    • https://cdn.shopify.com/s/files/1/0435/2029/5064/files/autism_spectrum_disorder_review_article.pdf
    • https://static.usrfiles.com/ugd/b8c837_f28915aefff245bcae49073376a60597.pdf
    • https://static.usrfiles.com/ugd/b8c837_9a0d2140dc5c485c8c0658163308a9da.pdf
    • https://cdn.shopify.com/s/files/1/0429/6255/0940/files/85556920008.pdf
    • https://cdn.shopify.com/s/files/1/0435/3264/8602/files/256_odu_ifa_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/5652/9557/files/xopogasamavupixez.pdf
    • https://cdn.shopify.com/s/files/1/0439/1341/2760/files/xuvexofokuvojeniv.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/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011a46.bin
2ba6e0c4516ae528974428ab90d2fcb845e31fc6427c3681d976df34e50bf0fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A46 6568 bytes
font_01_sfnt_off00012a93.bin
ae772815dda81d26b8815295b02744879901f895cedb19b5be3aad2a73083398		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A93 5360 bytes
font_02_sfnt_off00013ca6.bin
b3f14c79eedfe3e63b1bf02426892f9f21fbd4a9923dd1f7c6c1650fbc2b9ee2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13CA6 2972 bytes
font_03_sfnt_off0001492b.bin
9b6d883ec4b240178aa021abfb938bca99c6fc225a3154c2a05d57e367440a09		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1492B 10200 bytes
font_04_sfnt_off00016c41.bin
3dae81b76154e7c62b3b0d30507344c78f02ee9172d09a03fe7a9af96af9e849		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16C41 16116 bytes

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