Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c7aec32f136669d…

MALICIOUS

PDF

43.9 KB Created: 2020-09-18 05:38:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b70e43957cac6c919311f9c45bc4ccba SHA-1: 9b03c4cc9005a878a4514917d7671d9b603bd1f9 SHA-256: 8c7aec32f136669d4d4cae2037bb258c5090e7954ebff6281f7a82df42a914d4
150 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a primary URL identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to 'kindergarten ordinal numbers worksheet grade 1' and the malicious URL, suggesting a lure to disguise malicious activity. The PDF is flagged by multiple critical heuristics for malicious redirector links and a link farm, indicating a phishing or malware distribution attempt.

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=kindergarten+ordinal+numbers+worksheet+grade+1
    • http://files.lashtagsupply.com/uploads/1/3/0/7/130776795/6111bd5e.pdf
    • http://nurixes.thinkaboutlibraries.ca/uploads/1/3/0/7/130739994/vatewepufalivutiz.pdf
    • https://f2e2241f-8f61-4fcb-987a-bc35
    • https://5593f4f7-bdfa-4d29-a22d-163711bc6d1d.filesusr.com/ugd/c57cae_c571cdbbf17f4e109e850c89911b332c.pdf?index=true
    • https://4c27d1a8-8b44-4868-a251-12d7c54c7d35.filesusr.com/ugd/d43733_c03c3c44f35a4fc89c0ac7fc0b0a81d7.pdf?index=true
    • https://bb90820b-a170-4486-ab39-30be8934d9e2.filesusr.com/ugd/54fa57_25390fe12b3a4cfaaeff50f08a3bd0e4.pdf?index=true
    • https://b8847c7f-8bdd-4ca9-a70f-d4aeb76f2555.filesusr.com/ugd/f0b6b3_918e465473f54a3b88514e07ab9e3333.pdf?index=true
    • https://99753726-115b-4baa-b0b1-fec080eeabde.filesusr.com/ugd/dec231_4ee8c8eb1a6747a893cd03f2fb3cf231.pdf?index=true
    • https://1bc132d0-3300-4058-a437-0cf9485a9881.filesusr.com/ugd/edb4a7_bb0645ae753f48d18ca4b5780b631880.pdf?index=true
    • https://67a69b25-4fa9-49ff-88bf-4ceb53738ef5.filesusr.com/ugd/9374a7_1128ce8d5f8647b29b18526088d2bce5.pdf?index=true
    • https://927712be-a55b-46c7-a247-bf31e88e2fff.filesusr.com/ugd/c162b3_a8442f13c2a44d6a97cd0fef8894d6b4.pdf?index=true
    • https://0bf3f075-f2d1-42c9-8499-93dd0d8fb223.filesusr.com/ugd/a51aec_b461236ff101480a88f2ce4dfb711582.pdf?index=true
    • https://394f7576-dd66-476a-9f0a-32bb9dfe33c9.filesusr.com/ugd/9dda13_330d821c26df409db3f585e1d1ac8ebf.pdf?index=true
    • https://4a38d5a2-2017-4a4d-8053-921eccf508d3.filesusr.com/ugd/3bbd68_03182d57bae345b6924d99a10b155b2b.pdf?index=true
    • https://0951cd0d-1732-48e3-888f-e0af7465a7db.filesusr.com/ugd/ee4d88_0fadf895b2a64f2098d2d3f328eaf164.pdf?index=true
    • https://0a954c03-5840-437c-81f1-eb7292d891a0.filesusr.com/ugd/3d0627_55cb09c311604ec7bbd514869ef92e70.pdf?index=true
    • https://f2e2241f-8f61-4fcb-987a-bc35eeefc7ae.filesusr.com/ugd/9734e7_211140a7242a4ad09513b0e2525b6604.pdf?index=true
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005ea4.bin
d93334459f68f3cc668fd31702fec8d1f91cd096db6a981db30d7d45873af2a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EA4 5436 bytes
font_01_sfnt_off000070f8.bin
93826acf0b78bf4bfff5a256a8b8a60d5198d195f088815f7f065f3429456208		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70F8 10296 bytes
font_02_sfnt_off00009418.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9418 4324 bytes

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