Malicious PDF — malware analysis report

Static analysis result for SHA-256 864809e911dd5edd…

MALICIOUS

PDF

44.0 KB Created: 2020-09-01 15:15:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ad56c2fda24314815302010c61242397 SHA-1: a87e5c789a98043deb2ed325cd93460bdc254a58 SHA-256: 864809e911dd5edde44a14ec8620f97d0114d4f79e1b84e854c4d97059196bf6
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm for SEO manipulation. One of the primary links, 'https://ttraff.com/wix?keyword=cow+eye+dissection+worksheet+pdf', is identified as a malicious redirector. The ML classifier also strongly flagged this PDF as malicious. The document body is heavily obfuscated and appears to be a lure for the malicious link.

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.com/wix?keyword=cow+eye+dissection+worksheet+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/6260fe_b5be9e5256dd4c10846fbfa10c27593d.pdf
    • https://static.usrfiles.com/ugd/7603ae_65f2f420d8c44d868557b4c06c6214f4.pdf
    • https://static.usrfiles.com/ugd/55cc32_974ffdd960304e929b18cb60ad51fadb.pdf
    • https://static.usrfiles.com/ugd/b8c837_4a4f14071a4c426f88c4eb5238b1e70f.pdf
    • https://static.usrfiles.com/ugd/a2e20a_f1e1be201d124b838e42e1495ef475f7.pdf
    • https://static.usrfiles.com/ugd/bfbc46_5536694255b14a9da60caeee126909d9.pdf
    • https://static.usrfiles.com/ugd/1be480_37ff825986df407898f24925056cda8e.pdf
    • https://static.usrfiles.com/ugd/b8c837_35bd4818978648018c63073c3b3f41d4.pdf
    • https://static.usrfiles.com/ugd/738632_9ccd004db25f4f0188f8caf8c90cf3ba.pdf
    • https://static.usrfiles.com/ugd/79e0dc_6e78f8ee36d34c98bee7fb032ae143a8.pdf
    • https://static.usrfiles.com/ugd/b8c837_d05f0c953a8b45b883990788c19958dd.pdf
    • https://cdn.shopify.com/s/files/1/0430/7694/4033/files/seduloguvexunozugiwuw.pdf
    • https://cdn.shopify.com/s/files/1/0428/4229/2390/files/10236404992.pdf
    • https://cdn.shopify.com/s/files/1/0460/9182/9412/files/math_worksheets_for_preschool_free_printable.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_off000060c3.bin
742105f13ee4e5610c581968992e3a8cda0879456046f15b6e01577380c9df7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60C3 5072 bytes
font_01_sfnt_off00007216.bin
f3636920d6c919b67e85809fd371eb91003400cbb74ed2acaaa390c48aac88a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7216 10328 bytes
font_02_sfnt_off00009516.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9516 4324 bytes

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