Malicious PDF — malware analysis report

Static analysis result for SHA-256 f432c5660d2af716…

MALICIOUS

PDF

35.7 KB Created: 2020-08-29 19:53:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f62b1892414534020e2d114368339dcf SHA-1: f8c746d858c052452c859f5dfb97c32c7556e27d SHA-256: f432c5660d2af716113d4f494d1e49b381b4f4a5ea71dfb13d6bd72fa90b3d77
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many pointing to shopify and static.usrfiles.com domains, masquerading as an "Office 365 activator". One critical heuristic identified a link to known malicious redirector infrastructure at ttraff.cc. This suggests a phishing or scam attempt designed to lead users to malicious content. No scripts were extracted from this sample.

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=office+365+activator+reddit
    • https://cdn.shopify.com/s/files/1/0434/6816/1184/files/tunoxadosufivusi.pdf
    • https://cdn.shopify.com/s/files/1/0437/9571/0113/files/33540129155.pdf
    • https://cdn.shopify.com/s/files/1/0432/7079/9510/files/67865933685.pdf
    • https://static.usrfiles.com/ugd/1c90dc_8911600b039d44dab96a9f2c421ab919.pdf
    • https://static.usrfiles.com/ugd/b8c837_3837437e7d25421aab3b50b912a17539.pdf
    • https://static.usrfiles.com/ugd/b8c837_1e07387318ce4705b798c2e772f050b9.pdf
    • https://static.usrfiles.com/ugd/b8c837_e8f9b1f3727c49e0a214c508011206bd.pdf
    • https://static.usrfiles.com/ugd/b8c837_55a4ab05ba9d4189aa70c04d4c3ec15d.pdf
    • https://cdn.shopify.com/s/files/1/0437/6333/5326/files/48682675405.pdf
    • https://cdn.shopify.com/s/files/1/0430/7661/6353/files/sorting_algorithms_mcq.pdf
    • https://cdn.shopify.com/s/files/1/0434/5744/6038/files/2741599809.pdf
    • https://cdn.shopify.com/s/files/1/0429/4737/9356/files/vilaninepune.pdf
    • https://static.usrfiles.com/ugd/b8c837_13a0100fd7514212b070df1b1c882c39.pdf
    • https://static.usrfiles.com/ugd/b8c837_6d956ce77f8b44fa80c665f0e1b82399.pdf
    • https://static.usrfiles.com/ugd/b65acf_bfb4cdf9e365448b956f3affd8f3fa6e.pdf
    • https://static.usrfiles.com/ugd/b8c837_f4f2d3a8e00f4a29adb9ef6f804fe0dd.pdf
    • https://static.usrfiles.com/ugd/0f5b72_9fd2b480241642daa9b3528071e543d5.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_off00004ddc.bin
62e5acb291debb4b2f56434eb758a9c8b4794a484038f685f447e9cdb7e4fd21
pdf-font-stream PDF embedded font (sfnt) at offset 0x4DDC 5332 bytes
font_01_sfnt_off0000600e.bin
7e6a73d66220b2a2f2ac21d24d28eacbedd973fa6940d580e166b0517755daf0
pdf-font-stream PDF embedded font (sfnt) at offset 0x600E 10024 bytes