Malicious PDF — malware analysis report

Static analysis result for SHA-256 b266b660677ebf6d…

MALICIOUS

PDF

49.7 KB Created: 2020-09-02 02:09:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d774024744aba104557d773bfb3bed12 SHA-1: 84ef0f2f6d718843a4108654e8afb4c23f8a0e27 SHA-256: b266b660677ebf6d93d66eb698333fbfb44aa50c9a99c5785cbcdd02f722f9fb
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/wix?keyword=internship+report+example+architecture'. This URL is embedded within the document's body, suggesting a social engineering attempt to lure the user to malicious infrastructure. The ML classifier also strongly flagged this PDF as malicious. The document body itself is heavily obfuscated but contains the same redirector URL.

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.cc/wix?keyword=internship+report+example+architecture
    • https://static.usrfiles.com/ugd/a07927_3ab06e4064cd4ca0a54bfd33ca3f4796.pdf
    • https://static.usrfiles.com/ugd/f84671_e89d5f8cbd2a4f86a215ca0d4e8a4616.pdf
    • https://static.usrfiles.com/ugd/21e6f2_cc5ddcf31e63471d9ce763c9ec24d33a.pdf
    • https://static.usrfiles.com/ugd/0f1814_deae40244a144479a6ab8f9fa409fce8.pdf
    • https://static.usrfiles.com/ugd/bb13a2_8d9dcc0ee98347c7803e0a333a5a161e.pdf
    • https://cdn.shopify.com/s/files/1/0433/4501/9045/files/gonolenozajapepefov.pdf
    • https://cdn.shopify.com/s/files/1/0449/5068/3816/files/21723409036.pdf
    • https://cdn.shopify.com/s/files/1/0431/7816/4387/files/1523973191.pdf
    • https://cdn.shopify.com/s/files/1/0432/7640/2854/files/68732884190.pdf
    • https://cdn.shopify.com/s/files/1/0437/8614/1847/files/formative_assessment_tools_for_kindergarten.pdf
    • https://cdn.shopify.com/s/files/1/0428/5097/5910/files/78315863929.pdf
    • https://cdn.shopify.com/s/files/1/0431/7190/5698/files/abramelin_ritual.pdf
    • https://cdn.shopify.com/s/files/1/0435/1282/3967/files/bose_soundbar_300_operation_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/4953/3088/files/dworshak_fishing_report.pdf
    • https://cdn.shopify.com/s/files/1/0431/9464/6689/files/vejetew.pdf
    • https://cdn.shopify.com/s/files/1/0431/5840/5274/files/nuxotuzijisuwise.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_off000082c9.bin
2499a810c0266804451b7144e6b3e711b159fe72a3feab9bfc278623e8cbbdf2
pdf-font-stream PDF embedded font (sfnt) at offset 0x82C9 5176 bytes
font_01_sfnt_off0000943e.bin
d7e7e733c4d70cd0b95b7843efa27f27742770b65fc3e10e8040ee32fed6f568
pdf-font-stream PDF embedded font (sfnt) at offset 0x943E 11236 bytes