Malicious PDF — malware analysis report

Static analysis result for SHA-256 19cf217c71197532…

MALICIOUS

PDF

43.2 KB Created: 2020-08-31 13:18:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1c9026506cdb7df12c2237a80a5263cf SHA-1: c4f8302c242e46a9c40d27eec93504a593f33dfe SHA-256: 19cf217c711975320ad767e62bc3380a4aec99397d9daa92694eedf717da81f1
152 Risk Score

Malware Insights

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

The PDF file 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 a URL that points to a redirector. The presence of a link farm with numerous external PDF links further supports the malicious intent, likely to distribute further payloads or conduct phishing attacks.

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.ru/wix?keyword=1992+instructional+fair+inc+worksheets
    • https://cdn.shopify.com/s/files/1/0437/2099/9064/files/venabewuxumafizav.pdf
    • https://cdn.shopify.com/s/files/1/0432/5035/2296/files/31465785481.pdf
    • https://cdn.shopify.com/s/files/1/0430/7815/6449/files/53759342766.pdf
    • https://static.usrfiles.com/ugd/dad90e_f80d880e068d42af96cbe23b44cf3bd4.pdf
    • https://static.usrfiles.com/ugd/36f25b_0113aa1532d946a39379bd27e0434e0b.pdf
    • https://static.usrfiles.com/ugd/e8506d_69ebc60121064adba18d04c1e7e6506b.pdf
    • https://static.usrfiles.com/ugd/a58b01_7fcffc8c1ac74b79933aa80b361d7f01.pdf
    • https://static.usrfiles.com/ugd/72216b_9bf080841d55492bb4d1c0d949b1e121.pdf
    • https://static.usrfiles.com/ugd/b8c837_2be2b8c580584df0ae00f4b5383ff0ce.pdf
    • https://cdn.shopify.com/s/files/1/0429/2250/8454/files/57633084216.pdf
    • https://cdn.shopify.com/s/files/1/0435/8720/7327/files/kunulirivizesuribolilal.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_off000068ca.bin
7f2559f817749aea964dc8b6c4890956f8be5f07f05bcb1be39a4c9fc70a18b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68CA 5368 bytes
font_01_sfnt_off00007b20.bin
fe5acf66bf74d5c73ec1425eea088a9933a244f3d48d633759eddd15ca4c0593		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B20 10668 bytes

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