Malicious PDF — malware analysis report

Static analysis result for SHA-256 c25c08c5eb42bfdf…

MALICIOUS

PDF

43.8 KB Created: 2020-08-31 10:30:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 104f33eb0c188b5c61f84995f47edda4 SHA-1: 86277766cfe78a37cfddca9e5aff1f0a47baa17c SHA-256: c25c08c5eb42bfdff525191f3053d72c1d10a7d4d965b85a84abcb0128441db9
152 Risk Score

Malware Insights

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

The PDF document was flagged as malicious by a machine learning classifier and contains a significant number of embedded links. One of these links, https://ttraff.com/wix?keyword=core+connections+algebra+2+answers+pdf, points to known malicious redirector infrastructure. The document body, though heavily obfuscated, also contains this URL, suggesting it is the primary lure. The presence of numerous other links to static.usrfiles.com indicates a link farm designed to distribute traffic or host further malicious content.

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=core+connections+algebra+2+answers+pdf
    • https://static.usrfiles.com/ugd/9c0842_33b66a4d931d45fa8000f5ab739c0412.pdf
    • https://static.usrfiles.com/ugd/b0b521_28d6c0d36c4c401e85110e0df9332791.pdf
    • https://static.usrfiles.com/ugd/77941b_e2623530e9c54bf2b79076b591955275.pdf
    • https://static.usrfiles.com/ugd/eb5a6a_e474b8e481514ac391d65cf89718e17e.pdf
    • https://static.usrfiles.com/ugd/b8c837_9a3b37f170d244a4b7b7ee49d1f1d659.pdf
    • https://static.usrfiles.com/ugd/48f461_119ba061b1434d82b23d63edd01a2c0c.pdf
    • https://static.usrfiles.com/ugd/33ab24_7a974327eff44f93974ddf6e90a0e0cc.pdf
    • https://static.usrfiles.com/ugd/b8c837_f76e49bd4db54925b40a48ba9ca7779d.pdf
    • https://static.usrfiles.com/ugd/0baf77_d3a9eb4c02b5458bb53c7468275b8af4.pdf
    • https://static.usrfiles.com/ugd/b8c837_ab510ceca5b543cf8b782a77f8b8efb8.pdf
    • https://static.usrfiles.com/ugd/3ceeb9_70aebba4ef324165abdd5d25970ebe8b.pdf
    • https://static.usrfiles.com/ugd/b11f6d_f947854b23da4fccae1897e4644b0358.pdf
    • https://static.usrfiles.com/ugd/b910ae_60deca2b574e43be8141b714250cdc1b.pdf
    • https://static.usrfiles.com/ugd/0a593f_8eaee37802794ce18d3d40aaa0818430.pdf
    • https://static.usrfiles.com/ugd/b8c837_bab4fb75bd07401dbd7e7bf39f9660f0.pdf
    • https://static.usrfiles.com/ugd/b8c837_68e2dc9261bb40a9a60e40b5ca68ed52.pdf
    • https://static.usrfiles.com/ugd/1f5cef_6411e29c928549d69889a0380c0ef888.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_off00006270.bin
dbc9cfa2f5607e0813d4fa1850d1e3c5a9d7da29bbdb5d15373b8d1f5f4f969b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6270 5592 bytes
font_01_sfnt_off00007589.bin
53ae38ba8ab3abf7dbeeae601cdc05e05029ac5b448fc07974607e8abceb4073		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7589 14164 bytes

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