Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaed75b031811117…

MALICIOUS

PDF

43.9 KB Created: 2020-09-01 20:38:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 21006af9210a6aa3dc8adbcb1f6fe25d SHA-1: f3abec42d8914149df486af8c273949e95c599f5 SHA-256: aaed75b03181111793a3723a8c75e58e371f5d9415614dd95216c486298671b6
154 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 critical heuristic indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL https://ttraff.com/wix?keyword=cypress+custom+reporter, which is likely the initial point of redirection. Additionally, the PDF exhibits characteristics of a link farm, with numerous embedded URLs pointing to static.usrfiles.com, suggesting an attempt to distribute malicious content or manipulate search engine results.

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=cypress+custom+reporter
    • https://static.usrfiles.com/ugd/64e449_114e356c2b2e4d4fb23addf9d25c4a44.pdf
    • https://static.usrfiles.com/ugd/b8c837_4c9e523034c3444dafbdfb705f38b5ef.pdf
    • https://static.usrfiles.com/ugd/6908d7_a0f827fa98c348e0a8d866ff875478ec.pdf
    • https://static.usrfiles.com/ugd/b8c837_7f8215a9ea514b359c48464451532b64.pdf
    • https://static.usrfiles.com/ugd/b8c837_75560a67bc894a448044a18ddd58077f.pdf
    • https://static.usrfiles.com/ugd/16a96a_5c6e2df05a5941d3957f79dd29f960b1.pdf
    • https://static.usrfiles.com/ugd/45e30f_e6b385392a824e51b70e6477834310fd.pdf
    • https://static.usrfiles.com/ugd/b8c837_a5e70e157be746149adf42f7af666429.pdf
    • https://static.usrfiles.com/ugd/9734e7_48a38cec1b9c4d4d902b25b4102259a4.pdf
    • https://static.usrfiles.com/ugd/c345b0_41a78e6b6e8e4b05bd9e56d664f0ea23.pdf
    • https://static.usrfiles.com/ugd/b8c837_104ba1b2b00b40cab1152d3abcee4455.pdf
    • https://static.usrfiles.com/ugd/e4a001_06f2c59838cd4e1684571d6f52ab9012.pdf
    • https://static.usrfiles.com/ugd/735424_08df4464cc7c47e0a6a85a62aeabc5d1.pdf
    • https://static.usrfiles.com/ugd/b8c837_652ec82e4edf4d4abc86e2035eafe8e9.pdf
    • https://static.usrfiles.com/ugd/b8c837_f3b86c16dfe740c0a94601885d5d65a7.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_off00006195.bin
05c9b5e1cb745853fad4c1bc3ca9c8ee715fd2bc648f421bd4574377529ccbea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6195 4688 bytes
font_01_sfnt_off00007199.bin
a62a61f8ffbe5924177b2a275f955d9f8a1e7551ba122ad522a3304604d4a5d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7199 10092 bytes
font_02_sfnt_off00009432.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9432 4324 bytes

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