Malicious PDF — malware analysis report

Static analysis result for SHA-256 555cd00ddfab32f1…

MALICIOUS

PDF

65.0 KB Created: 2020-08-29 14:14:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 57d338834188b6302edb46891d93aa99 SHA-1: 7118c96ede1202c6e84566d1dd13c592dbd91f79 SHA-256: 555cd00ddfab32f123c9dd653e0e921c77dbed15da2c10885c5288725307fcc3
120 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The primary malicious URL identified is https://ttraff.com/wix?keyword=hsk+4+vocabulary+list+pdf, which is likely used to redirect users to a phishing or malware download site. The document body, though heavily obfuscated, appears to be a lure related to 'hsk 4 vocabulary list pdf'. The presence of a link farm further supports the malicious intent.

Heuristics 3

  • 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.
  • 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=hsk+4+vocabulary+list+pdf
    • https://static.usrfiles.com/ugd/b8c837_65061ddcc2a14518bc7b47bbc370ada7.pdf
    • https://static.usrfiles.com/ugd/b8c837_cf674706d11f43ea869427b2b2bc124f.pdf
    • https://static.usrfiles.com/ugd/b8c837_5166c4a3b4b14b4d8feede66caf558f5.pdf
    • https://static.usrfiles.com/ugd/b8c837_0c283542dd054f8287c4545160b60715.pdf
    • https://static.usrfiles.com/ugd/b8c837_44b0e709360047d7a8a4b53da0210795.pdf
    • https://static.usrfiles.com/ugd/b8c837_68c449a8f5514fd8bdec4b1be8db192b.pdf
    • https://cdn.shopify.com/s/files/1/0434/6285/2761/files/eclipse_stephenie_meyer.pdf
    • https://cdn.shopify.com/s/files/1/0428/4874/7676/files/56099530253.pdf
    • https://cdn.shopify.com/s/files/1/0435/3540/1112/files/wazoler.pdf
    • https://cdn.shopify.com/s/files/1/0432/5621/7750/files/murmurio_vesicular.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_off00008691.bin
56793ad468b71ef9b276f391a5496a3aa299600a8856d2d50f426d873a1002e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8691 15532 bytes
font_01_sfnt_off0000b7cb.bin
a1758d06ed437624ed938f770f2bf2cd42d42974ef1e9792efdb544781ef0465		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB7CB 5564 bytes
font_02_sfnt_off0000cacf.bin
2c5fd8e8c1796289abc58f83d5ff6a39dfa9bd1dd6cd938724c62d2fe4e1d516		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCACF 15728 bytes

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