Malicious PDF — malware analysis report

Static analysis result for SHA-256 f890a54607ad8ad5…

MALICIOUS

PDF

39.2 KB Created: 2020-09-10 06:02:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 02fadffcf2507e0b6dd58c3953ea9df0 SHA-1: 402b95e4a27ca2cd77cd89125ecfda825a059d52 SHA-256: f890a54607ad8ad55a1edb2c219474aab1268488d3ef4c0495321f3335839e22
150 Risk Score

Malware Insights

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

The PDF document was flagged by multiple critical heuristics for containing a malicious redirector link and a large number of external links, indicative of an SEO link farm. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the embedded URLs and heuristic firings suggest the primary purpose is to lure users to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.link/pify?keyword=gruffalos+child+colouring+sheets
    • https://static.usrf
    • https://cdn.shopify.com/s/files/1/0432/5349/8019/files/potolobipalotato.pdf
    • https://cdn.shopify.com/s/files/1/0431/6083/0116/files/bokediseduxodomuvozime.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/50398535586.pdf
    • https://static.usrfiles.com/ugd/b8c837_69fedcdc486e465ea37485c580571494.pdf
    • https://static.usrfiles.com/ugd/04e6f9_f5a503c2630f48a2a86ffccd01cd9c6c.pdf
    • https://static.usrfiles.com/ugd/b8c837_7471b1917eb94287b999ede0c3e7c742.pdf
    • https://static.usrfiles.com/ugd/b8c837_81171a28561940d09ed1a8e461cc24b1.pdf
    • https://static.usrfiles.com/ugd/1813b3_ebd1e89cec5445cd910e9a5d75ead57f.pdf
    • https://static.usrfiles.com/ugd/b81754_ce3da4f7d2534566ba72abff7c494a9c.pdf
    • https://static.usrfiles.com/ugd/8a05ec_dd1349858f62491eb6e39f09a38024bf.pdf
    • https://static.usrfiles.com/ugd/0ad6c7_e32e805da22242ff83d0fabfbb2fce48.pdf
    • https://static.usrfiles.com/ugd/e5cbe5_eaac4b3c812b4f4ba02871fa733a8c24.pdf
    • https://static.usrfiles.com/ugd/b4609a_e0ff45808c3d4b51ba5548b68597bb9c.pdf
    • https://static.usrfiles.com/ugd/b8c837_31e591a6907047dc93217a5834b16001.pdf
    • https://static.usrfiles.com/ugd/227d0f_4a85510c25a54af09f7da461e1f0d245.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_off00005c05.bin
c28bed563a6421fd22ad370433354c170c82b98a13d93e1165f64f8e06d4c53f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C05 5312 bytes
font_01_sfnt_off00006e0d.bin
b1c1e0e947be96df3cb0953cc9af639f8d9138e88716bc53da9da6c295a8c96a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E0D 9776 bytes

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