Malicious PDF — malware analysis report

Static analysis result for SHA-256 57fb05fda4ee6031…

MALICIOUS

PDF

38.3 KB Created: 2020-08-29 06:22:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e89068a0464f974a3e77c9d1bd4d3686 SHA-1: c222f828237209126a6a17c12c07fc8deb160961 SHA-256: 57fb05fda4ee6031f95db48005759fb8ef3ea9ad36ba60b3a4757b7bd82b2402
154 Risk Score

Malware Insights

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

The PDF contains a mass of external links, with one prominent link pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the same text as the URL's keyword parameter, suggesting a lure. The presence of numerous links, many pointing to static.usrfiles.com, indicates a link farm designed to obscure the ultimate malicious destination. The ML classifier strongly supports the malicious nature of this PDF.

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=i+will+be+right+here+waiting+for+you+mp3
    • https://static.usrfiles.com/ugd/b8c837_3b5fbe4786ef4768a4884f1ebd64282f.pdf
    • https://static.usrfiles.com/ugd/b8c837_aeb44110d99648c3b79d8d75e65a9495.pdf
    • https://static.usrfiles.com/ugd/b8c837_60b4d206c38c471dbc1e33b39cfaf50f.pdf
    • https://static.usrfiles.com/ugd/b8c837_f0c2275576d54cdbb059520f99d8ca0a.pdf
    • https://static.usrfiles.com/ugd/b8c837_fd44c88ae4f14a7290df5eebe60b285e.pdf
    • https://static.usrfiles.com/ugd/b8c837_5d850ccd029d4e1cb951f54a314fe7d0.pdf
    • https://static.usrfiles.com/ugd/b8c837_5d930bf6192f4a5fbd60638776992fd6.pdf
    • https://static.usrfiles.com/ugd/b8c837_563e00509e5f4d25a3223ff5547c9d4d.pdf
    • https://static.usrfiles.com/ugd/b8c837_1d561bd7e3df411cb018252ae87adcdf.pdf
    • https://cdn.shopify.com/s/files/1/0431/0584/5397/files/10850441613.pdf
    • https://cdn.shopify.com/s/files/1/0436/3495/0304/files/beamforming_techniques_in_radar.pdf
    • https://cdn.shopify.com/s/files/1/0439/4447/6840/files/kutozesugebelapeluxamumi.pdf
    • https://cdn.shopify.com/s/files/1/0433/1775/6057/files/bible_app_for_java_mobile.pdf
    • https://cdn.shopify.com/s/files/1/0429/3532/0742/files/74023786508.pdf
    • https://cdn.shopify.com/s/files/1/0430/0128/2711/files/lefomexufe.pdf
    • https://cdn.shopify.com/s/files/1/0433/6749/7884/files/bobinado_de_motores_electricos_rosenberg.pdf
    • https://cdn.shopify.com/s/files/1/0430/1648/7065/files/tekuwurog.pdf
    • https://cdn.shopify.com/s/files/1/0430/1769/9477/files/84709589978.pdf
    • https://cdn.shopify.com/s/files/1/0431/7426/4996/files/41014328295.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_off00005650.bin
dd8495138420e0864fc893cc13c3dae514889c09a259165c35ec6319bca54706		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5650 5572 bytes
font_01_sfnt_off00006932.bin
e36d19d0e52cff144a813c4c2ef7caacf0b6144a2f604b94632e8ed599785655		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6932 10012 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.