Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c5e6dca9ffc63f3…

MALICIOUS

PDF

41.4 KB Created: 2020-09-01 08:24:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eec9349c3ce4761e24db091b9b4bf2b8 SHA-1: 90ba98c2964ea36bc682f7fde3022c3e1ad81d6c SHA-256: 4c5e6dca9ffc63f3328d726c7ca6c589dd5b155242e5d637af58ce8175f5b5a9
152 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.cc'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, many hosted on 'static.usrfiles.com'. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the target URL, suggesting a lure to a malicious site.

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.cc/wix?keyword=how+to+add+ruler+guide+in+photoshop
    • https://static.usrfiles.com/ugd/dc98cc_7bb7e2698bb0417f959a2a8cea1b00f8.pdf
    • https://static.usrfiles.com/ugd/d43733_c4ececcfd9644f4582ceb09f6a6f2efd.pdf
    • https://static.usrfiles.com/ugd/b8c837_a890250f56a84113a07372589ff5293c.pdf
    • https://cdn.shopify.com/s/files/1/0432/9740/7126/files/plant_pathogenic_fungi.pdf
    • https://cdn.shopify.com/s/files/1/0429/2296/7207/files/78173116619.pdf
    • https://cdn.shopify.com/s/files/1/0429/3014/3395/files/23210711682.pdf
    • https://cdn.shopify.com/s/files/1/0433/0664/7717/files/dinghy_mainsheet_bridle.pdf
    • https://cdn.shopify.com/s/files/1/0432/5038/5051/files/60821600295.pdf
    • https://static.usrfiles.com/ugd/384ea4_52196c75170e4db3a9b5e8b922b55f0f.pdf
    • https://static.usrfiles.com/ugd/b8c837_abb20bad16374a96ba6a072e9a25c470.pdf
    • https://static.usrfiles.com/ugd/a91264_a83c612c861e40268015626a321fbb56.pdf
    • https://static.usrfiles.com/ugd/b98abb_7655abff507940b8baa9eab89fb611b8.pdf
    • https://static.usrfiles.com/ugd/f14cf6_4522e28661cf4ea7b0360734f3a4424f.pdf
    • https://static.usrfiles.com/ugd/48d9a1_0c91848bcfc9406bb59c75f905ea5376.pdf
    • https://static.usrfiles.com/ugd/5b9a87_d7e2ff211d894cf9bbd5e39d432a5ad2.pdf
    • https://static.usrfiles.com/ugd/6846fe_ec4f58a52b0148a4a6ffac76cd01194f.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_off00005a71.bin
ee4362493af8b61b6dcf880618ebc5ed588058720d0c9129c8ab8e420a77fae4
pdf-font-stream PDF embedded font (sfnt) at offset 0x5A71 5272 bytes
font_01_sfnt_off00006c69.bin
21e8c179ea1f22711f846fce2560d0abbf9a106f6a6b4efc5997b0ad04265eff
pdf-font-stream PDF embedded font (sfnt) at offset 0x6C69 14252 bytes