Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9067eff6b0ff9bb…

MALICIOUS

PDF

45.5 KB Created: 2020-09-03 23:08:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a35c024db814768537c930ec44a3fb18 SHA-1: 2de1fa49ff9bbccd8616130cc75e235345d09455 SHA-256: a9067eff6b0ff9bb0500a7bd1c6d477194696613debecc8412b1c120f6aa1dc2
150 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, which points to a URL designed to appear as a general biology quiz. This URL leads to a link farm of numerous other PDFs hosted on Shopify, indicating a SEO-based spam or phishing campaign. The ML classifier also strongly flagged this PDF as malicious.

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.club/wix?keyword=general+biology+questions+with+answers
    • https://cdn.shopify.com/s/files/1/0432/8354/6267/files/john_deere_aerator.pdf
    • https://cdn.shopify.com/s/files/1/0436/1378/2178/files/metijojatumoxexa.pdf
    • https://cdn.shopify.com/s/files/1/0437/1031/6694/files/network_now_a1.pdf
    • https://cdn.shopify.com/s/files/1/0431/0971/2023/files/messenger_windows_7_32_bit.pdf
    • https://cdn.shopify.com/s/files/1/0429/4790/3654/files/83395879381.pdf
    • https://cdn.shopify.com/s/files/1/0430/0043/0746/files/wenefixajo.pdf
    • https://cdn.shopify.com/s/files/1/0434/5816/6949/files/asynchronous_programming_with._net.pdf
    • https://static.usrfiles.com/ugd/e7e4a0_4585e15d1eb841df98a3e916ed15459f.pdf
    • https://static.usrfiles.com/ugd/b8c837_149928f1bd4a4ddb87ba87799a200367.pdf
    • https://static.usrfiles.com/ugd/a72fa8_536e076f61984241b54a5e46e19667a8.pdf
    • https://static.usrfiles.com/ugd/e4d7df_0e31c3fcf407454987765f54c39e3111.pdf
    • https://static.usrfiles.com/ugd/08e331_f0f6ba54afd4493d8c5561066d9c3218.pdf
    • https://static.usrfiles.com/ugd/3ceeb9_08f69718617d4578b7fa890ca62673c6.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_off000073b7.bin
8f41edb3dcf3f0fefa6330ac07a46be18cb350c7113c630d27148eafc4ae2bf0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73B7 5440 bytes
font_01_sfnt_off0000863f.bin
cc4e07ed233f92abbe22f0c82e92a9332cf468fe2276492b19a185ec53ac1937		 pdf-font-stream PDF embedded font (sfnt) at offset 0x863F 10284 bytes

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