Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b24c90b9fe474e0…

MALICIOUS

PDF

42.4 KB Created: 2020-08-30 23:57:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7719f6f437e5308693dbf5b063cf76a0 SHA-1: b05287a5c2e11ad21239a668d1ae6024e6977ecf SHA-256: 5b24c90b9fe474e0ced3096de3bc89ba36e522fd82954468fe4d0a1086d0594d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/wix?keyword=dynapack+3000+sale'. Additionally, it exhibits characteristics of a PDF link farm, with numerous external links, many of which are to benign PDF files but one is a known malicious redirector. The ML classifier also strongly flagged this PDF as malicious. The document body contains garbled text but includes the malicious URL, suggesting an attempt to disguise or embed the malicious link within otherwise unreadable content.

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=dynapack+3000+sale
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/314c35_e7f65ebe0ada43f6ad206d839805abee.pdf
    • https://static.usrfiles.com/ugd/b8c837_32e61ae4a0ef43f6b939f1d1bb80e266.pdf
    • https://static.usrfiles.com/ugd/b8c837_6ab38440706a40fbb0be0d4e8ba6110b.pdf
    • https://static.usrfiles.com/ugd/b8c837_361361c48d774611bbb67d4743eaf568.pdf
    • https://static.usrfiles.com/ugd/b8c837_1dd34e1a38ad4bd3b22dbd4207583f8a.pdf
    • https://static.usrfiles.com/ugd/b8c837_3705223500e5488a8416facf6a26b62b.pdf
    • https://static.usrfiles.com/ugd/f46427_7e8185d0a0e845afbef417502295345b.pdf
    • https://static.usrfiles.com/ugd/de65f7_fd7f0de4ee6040a9bfba36cec5fb9039.pdf
    • https://static.usrfiles.com/ugd/b8c837_19e7d8f9dffa49db80747831204b553c.pdf
    • https://cdn.shopify.com/s/files/1/0432/9861/9557/files/76573862068.pdf
    • https://cdn.shopify.com/s/files/1/0466/2489/9237/files/naval_action_map.pdf
    • https://cdn.shopify.com/s/files/1/0431/7764/0092/files/twin_xl_cotton_fitted_sheet_only.pdf
    • https://cdn.shopify.com/s/files/1/0438/4430/5056/files/13914779587.pdf
    • https://cdn.shopify.com/s/files/1/0429/0835/2679/files/85398698332.pdf
    • https://cdn.shopify.com/s/files/1/0431/1141/5974/files/porezusafufamu.pdf
    • https://cdn.shopify.com/s/files/1/0435/7931/0239/files/gudevupusubanebat.pdf
    • https://cdn.shopify.com/s/files/1/0434/8893/6102/files/66262682708.pdf
    • https://cdn.shopify.com/s/files/1/0432/8564/3420/files/modal_verbs_exercises_advanced.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000057f5.bin
36f699e406aec8ecda17007fa17c605d64f030d134ac00798c2d3c0eb8d2f8fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x57F5 4852 bytes
font_01_sfnt_off0000687f.bin
04beecb535edaace4b14f042bd385eaf3d5bec25745ab633101491698c8a1f79		 pdf-font-stream PDF embedded font (sfnt) at offset 0x687F 11752 bytes
font_02_sfnt_off00008e52.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E52 4324 bytes

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