Malicious PDF — malware analysis report

Static analysis result for SHA-256 acf4025c79e10584…

MALICIOUS

PDF

40.5 KB Created: 2020-09-01 10:28:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0c354648cbbbbcf3f071ef77470ea1d6 SHA-1: 8e89d4a932722f20c04513439cb483baec2764a5 SHA-256: acf4025c79e105848e7ad89e4aa8f6b0ba637517241b969853491fb8527924c0
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.cc, which is designed to lure users to malicious content. The document body, though heavily obfuscated, contains the same URL and a keyword suggesting a lure. The presence of numerous external PDF links also indicates a link farm designed to attract traffic, likely to the malicious redirector.

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=apics+learning+system+free
    • https://static.usrfiles.com/ugd/5ecadc_616b63647ea546149c00f86796bb9934.pdf
    • https://static.usrfiles.com/ugd/45e30f_3f7c63a3deed4fcebf63a525af2757ec.pdf
    • https://static.usrfiles.com/ugd/b8c837_785771358b144249a8f55fa1d806eb23.pdf
    • https://static.usrfiles.com/ugd/7e6083_9578ac4b4c17426493a85dd8fac7df61.pdf
    • https://static.usrfiles.com/ugd/b8c837_5182941cd8684036b6e0e4b4ad047ed1.pdf
    • https://static.usrfiles.com/ugd/3dd68e_2229429a93834ff99a7044c1a20687f6.pdf
    • https://static.usrfiles.com/ugd/5d2cf3_8454196d63ae4bee99e1a62eb7bd9ad2.pdf
    • https://static.usrfiles.com/ugd/f63f29_ddf54bd06c2e4b2e80f6f6f4a4224c2e.pdf
    • https://static.usrfiles.com/ugd/b8c837_a5d220dd90284c729c86f96fde353a67.pdf
    • https://static.usrfiles.com/ugd/b8c837_3a1035ac50134c5da3e49d72c27d05b6.pdf
    • https://static.usrfiles.com/ugd/36f25b_fa5a78f680814b2da7264d55fa05d1a7.pdf
    • https://static.usrfiles.com/ugd/b444d4_49b85df8633749b6b52d8d850010e576.pdf
    • https://static.usrfiles.com/ugd/cbdbb6_806dcf46c3a94c58b25fa3a6c7af09b8.pdf
    • https://static.usrfiles.com/ugd/b8c837_75c628a5be214b1691c4ee4cf0d159f7.pdf
    • https://static.usrfiles.com/ugd/b8c837_9a36e93acd664a8b90e6c3864820f749.pdf
    • https://cdn.shopify.com/s/files/1/0432/7230/6843/files/60752247496.pdf
    • https://cdn.shopify.com/s/files/1/0435/8465/1423/files/beauty_apps_for_android_free.pdf
    • https://cdn.shopify.com/s/files/1/0431/8609/4248/files/nukoj.pdf
    • https://cdn.shopify.com/s/files/1/0429/6923/5619/files/bacilos_gram_negativos_no_fermentadores.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_off00005e4b.bin
4be05210e3b608f087232eb6ec1e5a99f9f48985797813e419adf9188565c9ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E4B 5428 bytes
font_01_sfnt_off000070bb.bin
f50f3f92aee1ba97c20c63ea85cee6ad845808adab695668e0acec9328423496		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70BB 10780 bytes

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