Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d195b38fa6c6753…

MALICIOUS

PDF

39.5 KB Created: 2020-09-02 17:45:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2bf1e239f54f5e1e8311886578572f6e SHA-1: e81e394245ff4e11adf2791e49b0dc50fc475fa9 SHA-256: 4d195b38fa6c6753c68765ff4945b4c24e34db5fe3afa5c1d00284e4cb30a036
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a malicious redirector link disguised as educational material. The ML classifier strongly indicated maliciousness. The primary malicious IOC is the redirector URL, which likely leads to further malicious content or exploits. The document body and embedded links are part of a link farm designed to appear legitimate while directing users to harmful sites.

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.club/wix?keyword=language+arts+worksheet+6th+grade
    • https://cdn.shopify.com/s/files/1/0428/5743/1196/files/vevor_heat_press_manual.pdf
    • https://cdn.shopify.com/s/files/1/0428/9105/1161/files/blackberry_link_for_pc_windows_8.pdf
    • https://cdn.shopify.com/s/files/1/0463/5131/9202/files/gimazuwi.pdf
    • https://cdn.shopify.com/s/files/1/0428/8220/3801/files/wuniweliberif.pdf
    • https://static.usrfiles.com/ugd/7ff653_d130b1659b6c455a8ae595eb218725c2.pdf
    • https://static.usrfiles.com/ugd/b8c837_74a7e9162a694b34bc0a06287e79a99f.pdf
    • https://static.usrfiles.com/ugd/430cb2_da6e4488c42b411f9d4eb8f722c7e08a.pdf
    • https://static.usrfiles.com/ugd/227d0f_ed90555cfdf34745af6156cd70c2e42f.pdf
    • https://static.usrfiles.com/ugd/ee4d88_3f35e6e4e04342a1ba8d901889b56abd.pdf
    • https://static.usrfiles.com/ugd/b85eb0_838412b36185480393ad8ec21e79b4b6.pdf
    • https://static.usrfiles.com/ugd/912de2_d9bd9196b919453f8f1a1c692fd2789a.pdf
    • https://static.usrfiles.com/ugd/7f16bd_e36b5aeb310d4236b9127a9803ef5002.pdf
    • https://cdn.shopify.com/s/files/1/0432/7591/1321/files/7464198862.pdf
    • https://cdn.shopify.com/s/files/1/0434/2149/9548/files/opencv_affine_transform_image.pdf
    • https://cdn.shopify.com/s/files/1/0432/5795/4464/files/58781836561.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_off00005c1a.bin
a4fc1321323de7e2a2d0c910f56ce0705b7c9829aa4f26bc35d78ced27a3aada
pdf-font-stream PDF embedded font (sfnt) at offset 0x5C1A 5304 bytes
font_01_sfnt_off00006e38.bin
7065c807abc9bdaad9dd2a87bde948e125b3a6ec36f80afb7bcbfc93dfa0010f
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E38 10348 bytes