Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf3d7fe75d2dccc7…

MALICIOUS

PDF

48.3 KB Created: 2020-08-31 07:06:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e1a1d9cd24a881848086542f515544e3 SHA-1: 78ab1099f5942ddef08a0f6f7aeb2a6b4f6202df SHA-256: bf3d7fe75d2dccc79553b83b2b2b72e40aede11e83b704449451eadd88538205
154 Risk Score

Malware Insights

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

The PDF was flagged for containing a malicious redirector link and a link farm. The primary malicious URL, 'https://ttraff.cc/wix?keyword=chromite+ore+tomb+raider', is a critical finding. The document body, though heavily obfuscated, also contains this URL and numerous other links to external PDFs, suggesting a coordinated effort to distribute malicious content or phish users. The ML classifier strongly supports the malicious verdict.

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=chromite+ore+tomb+raider
    • https://static.usrfiles.com/ugd/516793_276362e712d44d1791b93287b86debfe.pdf
    • https://static.usrfiles.com/ugd/b8c837_ce9bef7a5b524514a2015b534cdf4826.pdf
    • https://static.usrfiles.com/ugd/cb2bed_87e23ffbacc943bcad2d85d9e3ea37b1.pdf
    • https://cdn.shopify.com/s/files/1/0430/2703/8369/files/7513743037.pdf
    • https://cdn.shopify.com/s/files/1/0433/9885/6871/files/twilight_the_graphic_novel_volume_1_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/1483/1780/files/76480256251.pdf
    • https://cdn.shopify.com/s/files/1/0440/4668/0214/files/alistair_begg_sermons.pdf
    • https://cdn.shopify.com/s/files/1/0427/7311/9143/files/vamafivupa.pdf
    • https://static.usrfiles.com/ugd/493135_1aa84dd49b50450cb5bc6da4b799664f.pdf
    • https://static.usrfiles.com/ugd/9219f8_1de989b53a72427b89f8298d0969ec2a.pdf
    • https://static.usrfiles.com/ugd/d55797_1d0b2f1a31c9489c8fd5dd752e4bda90.pdf
    • https://static.usrfiles.com/ugd/ca300b_017d64f0a17f4f5db06570f2bcd276f1.pdf
    • https://static.usrfiles.com/ugd/b8c837_7f19fccfaa3946ce9e5e591fb39577f8.pdf
    • https://static.usrfiles.com/ugd/19103d_fa62f2bad50d419db5ff30b3d8198a4e.pdf
    • https://static.usrfiles.com/ugd/b8c837_a79300031340454fa1555e5f191688e0.pdf
    • https://static.usrfiles.com/ugd/b8c837_464caf8764254d4f9b7d54c1c6813de3.pdf
    • https://static.usrfiles.com/ugd/b8c837_3071b7d37d304df2b872c21493b74e10.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_off000071a4.bin
6b8104309de75eb9107ae8193fa3cd0d6bab62c466c332640494e04ee70027c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71A4 4700 bytes
font_01_sfnt_off00008193.bin
bd3bbfa0a9f1a1312c339463934dd2de2c8748f434cbbad421dda3bce4d39ea0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8193 10620 bytes
font_02_sfnt_off0000a5da.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA5DA 4324 bytes

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