Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f3afadaec9c5b8a…

MALICIOUS

PDF

41.2 KB Created: 2020-08-31 10:07:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 39a6ac02a76cada0f3af2368f5a45217 SHA-1: 6855f09cda05bbf366baa26a0411ef7c7e5d836e SHA-256: 4f3afadaec9c5b8a3a9a4b188a047aab92552048917db38819909012850b28e2
152 Risk Score

Malware Insights

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

The PDF document contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/wix?keyword=origins+guide+bo3'. Additionally, it exhibits a PDF SEO link farm behavior, embedding numerous external PDF links, many hosted on static.usrfiles.com. The ML classifier strongly supports the malicious verdict. The document body is heavily obfuscated but contains the same malicious URL, reinforcing the redirection attempt.

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=origins+guide+bo3
    • https://static.usrfiles.com/ugd/2e4eb4_74e681a7aeac4381af36345764bc69f8.pdf
    • https://static.usrfiles.com/ugd/0ebc1f_ad67b2514a3c4b9abd962764d201d87e.pdf
    • https://static.usrfiles.com/ugd/b8c837_1c0cb4a6acfd4ad98cf9c56e4c39bda3.pdf
    • https://static.usrfiles.com/ugd/ce5d00_430e4c8e038f45ceb13af8dc1fb71675.pdf
    • https://cdn.shopify.com/s/files/1/0431/7600/1704/files/baby_doll_sadri_video.pdf
    • https://static.usrfiles.com/ugd/b8c837_1063543c2d9b460a9568a7c07e9d1dca.pdf
    • https://static.usrfiles.com/ugd/e32576_284620503dde49c7a5287a84aa19d437.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/90278046640.pdf
    • https://cdn.shopify.com/s/files/1/0435/6079/6318/files/47279264282.pdf
    • https://cdn.shopify.com/s/files/1/0430/9513/0266/files/gejotupoti.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_off00006515.bin
ab11d01bc3cd7beae36240fa57f42e5e150fec70a041a7031bbf9636d450f22d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6515 5084 bytes
font_01_sfnt_off00007665.bin
5e731da07be702c5de55f3027353957c4ee231a2320775729c9cacd2fa604797		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7665 9980 bytes

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