Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4e734095ef06428…

MALICIOUS

PDF

40.5 KB Created: 2020-09-01 03:31:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 915e3d69aeb7ff5f0ba1bbaadf7dbff6 SHA-1: bf55e8d75780b8a6152b128eb0d5d21e80fb7b3a SHA-256: b4e734095ef064289f58dcdece2c250a11a34279e7d4f218ff0c94fda63ecc25
120 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one heuristic specifically flagging a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be the target of the malicious link. The presence of a link farm suggests an attempt to manipulate search engine results or distribute content widely, with the primary malicious link being the most critical IOC.

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.cc/wix?keyword=acoustics+of+buildings+pdf
    • https://static.usrfiles.com/ugd/b8c837_43940db074194fada2b71d292d73fb8a.pdf
    • https://static.usrfiles.com/ugd/9d869b_b08a0a3360784effbc0da29f16cec6a1.pdf
    • https://static.usrfiles.com/ugd/8cbfce_84ce5a324fb14739be6ffa719cf13c46.pdf
    • https://static.usrfiles.com/ugd/4c1554_8f2a9efb91c94e2ab422378b7c5d1299.pdf
    • https://static.usrfiles.com/ugd/1f2646_62744fa9873448d9b8002d6f91b23a53.pdf
    • https://cdn.shopify.com/s/files/1/0429/3866/3079/files/99443821572.pdf
    • https://cdn.shopify.com/s/files/1/0439/3343/4011/files/kegibu.pdf
    • https://cdn.shopify.com/s/files/1/0435/4991/7347/files/93338637859.pdf
    • https://cdn.shopify.com/s/files/1/0435/1967/2472/files/tiduwikerekilenudesas.pdf
    • https://cdn.shopify.com/s/files/1/0431/4818/1666/files/tale_of_kingdoms_minecraft_1.7.10.pdf
    • https://cdn.shopify.com/s/files/1/0429/9587/5989/files/17692622090.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_off00006250.bin
cbffd7a07cb2f654d1255c4e95f70d5f87972a564c62191ecf49dd252894ad33		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6250 5148 bytes
font_01_sfnt_off000073e9.bin
317f4d42de1b46458679a4cf6d166c8437c6e3160995cb14863e7307c9b06d76		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73E9 9964 bytes

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