Malicious PDF — malware analysis report

Static analysis result for SHA-256 760687495bc71172…

MALICIOUS

PDF

46.2 KB Created: 2020-08-31 12:27:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8d6347c5a299ee78c1c4946b62730f99 SHA-1: 35334bb6be8acd5bbff5781c86af5a8e8f0ff491 SHA-256: 760687495bc711720fe97384dec4fda68bfd51c2c5e9326bf76015c5013ed2a9
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The document body, though heavily obfuscated, contains text related to 'California mission worksheets' and includes the malicious URL. The ML classifier strongly indicates maliciousness, suggesting the document is designed to lead users to harmful content.

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=california+mission+worksheets
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/10a4aa_afa0999176534c0a9cffcb33d5229397.pdf
    • https://static.usrfiles.com/ugd/5b604d_662d826d8f7948afa36cb4d34d6c7600.pdf
    • https://static.usrfiles.com/ugd/b8c837_024c52b47c7746208769a887c0192cc8.pdf
    • https://static.usrfiles.com/ugd/ca32a8_b28be10a2a014b0493a2ffa0a161d9ce.pdf
    • https://static.usrfiles.com/ugd/ae15ca_7251d00497af4313b8acd74cb25d53d1.pdf
    • https://static.usrfiles.com/ugd/b8c837_1ae3e6064b424afe9cd6a91dd3414cc2.pdf
    • https://static.usrfiles.com/ugd/e6092c_53868e51f4834ba09fe77ab493ca504d.pdf
    • https://static.usrfiles.com/ugd/b8c837_7c0483a44233446fa93c17cea1211680.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/84005007378.pdf
    • https://cdn.shopify.com/s/files/1/0432/0739/3435/files/73815155073.pdf
    • https://cdn.shopify.com/s/files/1/0429/7755/8681/files/girerusebepodeki.pdf
    • https://cdn.shopify.com/s/files/1/0438/5135/0166/files/21607540371.pdf
    • https://cdn.shopify.com/s/files/1/0428/7689/5398/files/kapesipapulodofelinegapul.pdf
    • https://static.usrfiles.com/ugd/08fe48_46a1bdb8dbae4467be3c0836dcfabf74.pdf
    • https://static.usrfiles.com/ugd/b8c837_070ce2bf6836403db4bed0a752beced0.pdf
    • https://static.usrfiles.com/ugd/3aee12_16e2331b57d84fe3b274741d0cb3630f.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007670.bin
5a8691fd0fd3420bb284ac24086eb691dc1a2d8c1d550034ed4c406ecedc5c2e
pdf-font-stream PDF embedded font (sfnt) at offset 0x7670 5068 bytes
font_01_sfnt_off00008795.bin
4f5b1dfa22e26234362b5dcb9ad86486f344727e883e9f6f8cb8c90378563d24
pdf-font-stream PDF embedded font (sfnt) at offset 0x8795 10664 bytes