Malicious PDF — malware analysis report

Static analysis result for SHA-256 15b7ed6a2ae470ef…

MALICIOUS

PDF

42.1 KB Created: 2020-08-31 01:13:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5048fc62a173f54119925d6d6250fda1 SHA-1: d059fe565e99001bf66016c68d7c4c8126abd4fd SHA-256: 15b7ed6a2ae470ef32df844899f0a6a65ab2cbc77de569190cf9fdf34abd1ac5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded links, with one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting a coordinated effort to distribute content or redirect users. The ML classifier also strongly flagged this PDF as malicious. The primary malicious IOC is the redirector URL, which likely serves as a gateway to further malicious activity.

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=comentario+de+texto+manifiesto+de+sa
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/1293/2255/files/xaporogodox.pdf
    • https://cdn.shopify.com/s/files/1/0443/8904/0294/files/world_hardest_math_problem_with_answer.pdf
    • https://cdn.shopify.com/s/files/1/0433/4790/2622/files/3267814168.pdf
    • https://cdn.shopify.com/s/files/1/0440/1519/0181/files/adaptive_cruise_control_report.pdf
    • https://cdn.shopify.com/s/files/1/0439/8442/1022/files/bitixafedoje.pdf
    • https://static.usrfiles.com/ugd/a771bd_917e407b8303473aa8d12e4369d23a04.pdf
    • https://static.usrfiles.com/ugd/d7ba0f_9944fd316825416cab4db3289dced2c2.pdf
    • https://static.usrfiles.com/ugd/b8c837_4c7a57557ae546768cdda66454398000.pdf
    • https://static.usrfiles.com/ugd/b8c837_15a4f5a93a2748b7bd9503e57016333a.pdf
    • https://static.usrfiles.com/ugd/7c3584_a0fe3f9da5e7417fbbf5ccc4a08156fd.pdf
    • https://static.usrfiles.com/ugd/b8c837_5ef510d21cea40feb2e98415b686354f.pdf
    • https://static.usrfiles.com/ugd/b8c837_09ff9eee10534719a34530a46cfcff34.pdf
    • https://static.usrfiles.com/ugd/4bb894_eaab5e1d4a6a4008a870c32e8cbabd05.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_off0000656b.bin
1c74c675ceaedc0d40ac9c2fbc932e62598ca69b0b290e77b6e324cff201378a
pdf-font-stream PDF embedded font (sfnt) at offset 0x656B 4996 bytes
font_01_sfnt_off00007649.bin
e4c13df910b06148fe252cc5e667f64601f3fa1d2210c39bdc244c8f20b6667b
pdf-font-stream PDF embedded font (sfnt) at offset 0x7649 10888 bytes