Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1ed748d5795c4a6…

MALICIOUS

PDF

46.6 KB Created: 2020-09-01 03:04:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f95cfd37219f7bd5727e567a45aaee07 SHA-1: 4aeb722100f43bca2503bb30228981bf8dedbca1 SHA-256: b1ed748d5795c4a606010ada0aff27102c4101fa9444a266e4f695e7a1c7d6bb
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, forming a link farm. One of these links, 'https://ttraff.com/wix?keyword=macaw+parrot+image', points to known malicious redirector infrastructure. The document body appears to be malformed or corrupted, but the presence of the malicious redirector URL strongly suggests a malicious intent, likely to lure users to a compromised site. 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.com/wix?keyword=macaw+parrot+image
    • https://static.usrfiles.com/ugd/b8c837_83408f72035d4856865fce5046171f54.pdf
    • https://static.usrfiles.com/ugd/e2c250_9b525e6272744c148d2bff31d771d89d.pdf
    • https://static.usrfiles.com/ugd/238140_05ece852fb68468ca0ce2f18ebef457a.pdf
    • https://static.usrfiles.com/ugd/b8c837_e63621dc43304f2ba6b4accc554dcec6.pdf
    • https://static.usrfiles.com/ugd/e2c250_60f03a5e3f494be9abd03ebff57c83b8.pdf
    • https://static.usrfiles.com/ugd/fedf23_0d5b50288c77407ca07cbcdab43f10eb.pdf
    • https://static.usrfiles.com/ugd/6846fe_c946777820a241a7bb3d1fdf2f0b9dc3.pdf
    • https://static.usrfiles.com/ugd/e5a943_11239657ecea4ca9985348849ce3e22b.pdf
    • https://static.usrfiles.com/ugd/63d3ad_82fabc415ca742d6a7503eb82c13e789.pdf
    • https://static.usrfiles.com/ugd/9b33c5_e702acaf5b3f4f6299f58af208791ad2.pdf
    • https://static.usrfiles.com/ugd/b8c837_20de3a8b3a7c429c996668ffc80d8e8f.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_off0000764e.bin
cb6bc9bd89f6a97d16be5de732a2f3611cbd6bd5aad2e93ab08be24c746a70e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x764E 5140 bytes
font_01_sfnt_off000087d5.bin
c60486ee14caaa82732cb19d85c871b3776b817386671738963ceead2da07d62		 pdf-font-stream PDF embedded font (sfnt) at offset 0x87D5 11988 bytes

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