Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d45179787ac2642…

MALICIOUS

PDF

42.1 KB Created: 2020-09-19 04:37:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2211c20d361a4f60564fe50a240c2302 SHA-1: 658d65080d3a1519a6ca4d37d172c96a77f487e3 SHA-256: 6d45179787ac264233e78ba362e08e432ed8e4fdcdea0ba8c3a9dd397c7ed982
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The heuristic firings indicate a link farm designed to distribute content, and the ML classifier strongly suggests malicious intent. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector found in the heuristics, suggesting a lure for users to click through to potentially malicious 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.club/wix?keyword=pm+3110+final+exam+answers
    • http://files.pulaskihealthcarecenter.com/uploads/1/3/0/7/130776275/b6950be3b89dde0.pdf
    • http://files.tnpost289.com/uploads/1/3/0/7/130776131/vaxedix_vojofewitoxi_xukezubokeru.pdf
    • http://files.rohanbopannatennis.com/uploads/1/3/1/8/131871687/3672773ff49c.pdf
    • http://files.jostenscanada.com/uploads/1/3/1/6/131606668/xarizumir.pdf
    • http://momiwoten.odysseyandabroad.com/uploads/1/3/1/4/131453723/58a525115.pdf
    • http://files.smallboatvt.com/uploads/1/3/2/7/132712207/woxera.pdf
    • http://files.shopfashionrescue911.com/uploads/1/3/1/8/131872087/tutiguzegi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://f3417745-580d-4d99-bbe2-29c696ec3ea5.filesusr.com/ugd/46bfb0_9597880bbf2a4e66957dbc7f9615adbb.pdf?index=true
    • https://a7ab9e61-b396-41eb-a96f-d324000224f8.filesusr.com/ugd/ce77c6_031d7ea6ba684c798ed839a1b632816e.pdf?index=true
    • https://020e0ba7-b2f3-488a-b4a3-38407df47103.filesusr.com/ugd/7e6083_01617ca5fa254f3c95fa13557322f59f.pdf?index=true
    • https://019af1fc-bb7a-4be8-992a-a013470406a1.filesusr.com/ugd/ce0e6d_9f560420ed2d4a96a8270f522aa1bd96.pdf?index=true
    • https://a8bf836e-3bb5-408c-9bc0-373ff2f3fca4.filesusr.com/ugd/76dd3d_997cb75313a44a53a47b3c50892f4af4.pdf?index=true
    • https://e2695ca9-874f-4f1a-a048-8c39f562b2ab.filesusr.com/ugd/2eec94_32a8293532694766ac84d752fdb266cf.pdf?index=true
    • https://a4aaad1a-10c9-450f-9d1c-0f4f07b77001.filesusr.com/ugd/debdc1_fd1d57c400ea4b959414babeb60e1ab7.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005af4.bin
b946ee0184554b51a2c414cc56b4ebc6377f9ecc034fc4e7683b813ea4986f6b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5AF4 5028 bytes
font_01_sfnt_off00006bee.bin
82fa93e11571bb75326135e0441ad396a1bc4b4ea03b87e3f4e3588cfc52a2e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BEE 10016 bytes
font_02_sfnt_off00008df4.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8DF4 4324 bytes

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