Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc9c8c1d1bfc2349…

MALICIOUS

PDF

40.0 KB Created: 2020-09-19 13:21:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0cc3e18887ee1dc55297b76d1a55b8d8 SHA-1: a9b85e26f583545209d5c8d7b7412e83f947196b SHA-256: bc9c8c1d1bfc23491e8a9023be47d87ecdb332a9743d39292d93e19dc88b69ba
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, contains a URL that appears to be the primary lure. The presence of a link farm suggests an attempt to manipulate search engine results or distribute content broadly. The ML classifier strongly indicated maliciousness.

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.club/wix?keyword=mistresses+season+2+episode+guide
    • http://files.ptfinejewelrydesigns.com/uploads/1/3/0/8/130813489/85ea1b75b.pdf
    • http://files.nhdmo.org/uploads/1/3/0/7/130776674/1050151.pdf
    • https://cdn.shopify.com/s/files/1/0436/3013/3408/files/create_a_job_application_spreadsheet_in_excel.pdf
    • https://cdn.shopify.com/s/files/1/0428/8000/8355/files/nadojoluwelasenivuko.pdf
    • https://cdn.shopify.com/s/files/1/0432/3262/4797/files/vogomelurufebogoruku.pdf
    • https://4de3c1dc-07ac-48f8-8e04-4afbe62a068b.filesusr.com/ugd/9ff9b8_07a0bd841ccf4dceb38e1b6b81495bda.pdf?index=true
    • https://f11923d2-8d12-4a17-8c9b-860daa08e33c.filesusr.com/ugd/5f226b_76f7657d87874037a4060fba617bf060.pdf?index=true
    • https://d03b8c09-6f4c-4a50-bec0-6b38e296049a.filesusr.com/ugd/2f3ac6_8d455d219be74dd6b8d1645bc0f6083f.pdf?index=true
    • https://9619fce4-0e27-4ba3-b014-b733d1bb37fa.filesusr.com/ugd/7fedcf_24d40c9e82314603bcee840426d5be08.pdf?index=true
    • https://b46e88be-3f4e-4012-81ac-78a6e4a68af9.filesusr.com/ugd/f99735_f2b5561a3773421ab0b7428479f1e1c1.pdf?index=true
    • https://dea11505-73af-4249-a983-780c81101104.filesusr.com/ugd/ede58b_de5345b07d5440aea6733d3a852b3cd1.pdf?index=true
    • https://096b37cb-a9b2-481b-b343-9fe36ee67320.filesusr.com/ugd/3826db_512b32989e35477386f4deadb0874980.pdf?index=true
    • https://0f0d0b86-e118-4d9b-b954-83b89a4057fc.filesusr.com/ugd/278743_6d172b88099a448fba123e65b4280d0a.pdf?index=true
    • https://1215b116-e7f2-46ff-9494-063d23b7c61d.filesusr.com/ugd/154db6_f3537a1131c24c759b36acbfacc929a5.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_off0000517a.bin
9f521a1325c104647275263d4a9abf216d062d9380a34499e8e6cc5e14d0aacc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x517A 5116 bytes
font_01_sfnt_off000062ef.bin
35960fb82470d12c02066cf19664beff0daf841b392ff3753ac6ff44a7b370b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62EF 10068 bytes
font_02_sfnt_off00008557.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8557 4324 bytes

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