Malicious PDF — malware analysis report

Static analysis result for SHA-256 be4c83471e3953bb…

MALICIOUS

PDF

41.4 KB Created: 2020-09-03 03:42:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c675ce87c03bc20582b65a1d3157e5d5 SHA-1: da3ad4910c0826f0c304e71f47fb54b07ba7a026 SHA-256: be4c83471e3953bb35fd48ea97e2abaa4bd2cba26dc0e5b5d957af41a935f10b
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.me, which is likely used to deliver a secondary payload. The document body, though heavily obfuscated, contains the target URL and appears to be a lure related to 'centrifugal compressor pdf'. The presence of numerous external links, many pointing to benign-looking PDFs on static.usrfiles.com and shopify.com, suggests a link farm or SEO poisoning tactic to increase the visibility of the malicious link. 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.me/wix?keyword=centrifugal+compressor+pdf
    • https://static.usrfiles.com/ugd/3835dd_8d70c379e8da4d2e85dcabd40f51b4ff.pdf
    • https://static.usrfiles.com/ugd/76de1a_5756f592504840e9a5828c109b696056.pdf
    • https://static.usrfiles.com/ugd/82d61e_7024fa092c32475985bb707af265596c.pdf
    • https://static.usrfiles.com/ugd/a467d2_7305ad1b11204868b975a83f18181650.pdf
    • https://static.usrfiles.com/ugd/63022f_f33986ade7834935aca24e2af1bb2e0b.pdf
    • https://cdn.shopify.com/s/files/1/0434/0131/4454/files/sewowulexudutipor.pdf
    • https://cdn.shopify.com/s/files/1/0428/8951/1068/files/55281498161.pdf
    • https://cdn.shopify.com/s/files/1/0431/2891/4074/files/calineczka_ba.pdf
    • https://cdn.shopify.com/s/files/1/0434/0560/7079/files/all_quiet_on_the_western_front_free_download.pdf
    • https://static.usrfiles.com/ugd/6cfc61_e67c65fb0090442fb1bbc5dd046fcf7e.pdf
    • https://static.usrfiles.com/ugd/d90490_96904be19bab4cf181a1143f3eead037.pdf
    • https://static.usrfiles.com/ugd/1fbf8b_f4244e1fb0c64f43810552ae1d93f20f.pdf
    • https://static.usrfiles.com/ugd/3bf302_db6a40846e914a47b31724be46a1a6b8.pdf
    • https://static.usrfiles.com/ugd/7d21c0_f1ba66ae9aaf4e99a603d32bda7e7a51.pdf
    • https://static.usrfiles.com/ugd/b8c837_cb993aec78354c05bc22b84878ffdd64.pdf
    • https://static.usrfiles.com/ugd/b8c837_01abae187c814641bd7c5b67a3d3278f.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_off0000637f.bin
8680b712c32405e36d104d55029c75fa9ed6efec73b80578cb43b93940aac6b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x637F 5380 bytes
font_01_sfnt_off000075b0.bin
8231d47693a4e73a54257f0660bf975697964e1cb240fcd5e0bde9b045403297		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75B0 10488 bytes

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