Malicious PDF — malware analysis report

Static analysis result for SHA-256 e209310e7233e552…

MALICIOUS

PDF

48.0 KB Created: 2020-08-31 11:44:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e0ab5d5c00b997be57ada145f5650861 SHA-1: 06ecc11793769229023c48c698c052cfe18256f4 SHA-256: e209310e7233e55265e38b0ebad07778973cabeae4e64b7ae02dafcf967dfa76
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.link/wix?keyword=100+startup+pdf'. Additionally, the PDF exhibits characteristics of a link farm, embedding numerous external links, many hosted on 'static.usrfiles.com'. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the malicious URL and references to '100 startup pdf', suggesting a lure.

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.link/wix?keyword=100+startup+pdf
    • https://static.u
    • https://static.usrfiles.com/ugd/b8c837_3011a4f3a1d545b59a2c0ab3f6444fef.pdf
    • https://static.usrfiles.com/ugd/ad2ade_2d947d5b126546db8b3b9d89f022b099.pdf
    • https://static.usrfiles.com/ugd/b0cd75_e8c7a5f48085479bba6081c33e7dd070.pdf
    • https://static.usrfiles.com/ugd/df73ab_37685a97c5e64535b32ffd88475c29ba.pdf
    • https://static.usrfiles.com/ugd/3aee12_d8f4b5b0955e418b83c62af1c4c882c3.pdf
    • https://static.usrfiles.com/ugd/b8c837_928d4ae96bb3437abc9af4af673dde39.pdf
    • https://static.usrfiles.com/ugd/1cfe37_ee1caeb8786343798eac7fd33edf4847.pdf
    • https://static.usrfiles.com/ugd/b8c837_b65c760b31a648a095036790a0873184.pdf
    • https://static.usrfiles.com/ugd/3b7182_495cd09a3ca4420694c557dc26b83136.pdf
    • https://static.usrfiles.com/ugd/5bb01c_29e4c71801eb4454bda03a6014c24a86.pdf
    • https://static.usrfiles.com/ugd/b8c837_33addcbd8a7c4947b9607219c9691ddd.pdf
    • https://static.usrfiles.com/ugd/271e65_658959e44534478ca52cbd2f99028b67.pdf
    • https://static.usrfiles.com/ugd/217d68_1491bdaf7e0a4ca3b404fdf48f983adc.pdf
    • https://static.usrfiles.com/ugd/158fb9_fff36d8b1c2c43f5921a01f8a2af5244.pdf
    • https://static.usrfiles.com/ugd/fd7405_f80535ff1cd74949867514d91756bfd0.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007077.bin
762e238dcc77c8ac0024061ff17dd1602108b2b470d9e44e457bbad828d17bb6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7077 4604 bytes
font_01_sfnt_off0000800f.bin
44f20b4ab7657f6dd89ef7f47411550d83be2f04e50e30acf9f1b85b25309a7c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x800F 10968 bytes
font_02_sfnt_off0000a4bf.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA4BF 4324 bytes

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