Malicious PDF — malware analysis report

Static analysis result for SHA-256 0401ebbc4b37bf8f…

MALICIOUS

PDF

55.8 KB Created: 2020-07-29 13:06:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6501e6d2927555cb6f6f883ec21d7166 SHA-1: 49145343f7f9048b812058f10e6ef15dc568e7ca SHA-256: 0401ebbc4b37bf8fdf43d08161ad59e2f6cb715d7b6dffa549f9e8d251b54d87
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF file that contains a large number of embedded links, many of which point to potentially malicious redirector infrastructure. The ML classifier strongly indicated maliciousness. While no scripts were extracted, the presence of numerous external links, including one to a known malicious redirector, suggests an attempt to lure users to malicious sites, likely for phishing or SEO spam.

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/pify?keyword=notes+bass+guitar+fretboard+pdf
    • http://files.scphimu.com/uploads/1/3/1/4/131453146/sujimomewusewop.pdf
    • http://files.camera1.ca/uploads/1/3/1/3/131380413/pizixejawij.pdf
    • http://files.ddraonline.com/uploads/1/3/0/7/130739120/pexuxudeze-pegopisofip.pdf
    • http://files.vetwoundlibrary.com/uploads/1/3/1/8/131871479/mipabibajab.pdf
    • http://files.freshbakerydelivers.com/uploads/1/3/1/4/131407051/fitizikoju_pukipe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/0705/7825/files/2684411753.pdf
    • https://cdn.shopify.com/s/files/1/0427/7826/3718/files/50682835047.pdf
    • https://cdn.shopify.com/s/files/1/0434/4276/5976/files/rigixexabapetirotidafov.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/61047377128.pdf
    • https://cdn.shopify.com/s/files/1/0439/0918/5688/files/77911025789.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/woburorofinuxup.pdf
    • https://cdn.shopify.com/s/files/1/0433/9410/5509/files/28660824255.pdf
    • https://cdn.shopify.com/s/files/1/0432/1778/0896/files/kixutokiwalebuneb.pdf
    • https://cdn.shopify.com/s/files/1/0440/4248/5910/files/58026680621.pdf
    • https://cdn.shopify.com/s/files/1/0434/7052/0470/files/ditaluxurubinip.pdf
    • https://cdn.shopify.com/s/files/1/0431/4942/6845/files/fabazojefef.pdf
    • https://cdn.shopify.com/s/files/1/0434/2834/8056/files/xarikipibejuri.pdf
    • https://cdn.shopify.com/s/files/1/0430/8090/8949/files/nifamekapovavukepaxemome.pdf
    • https://cdn.shopify.com/s/files/1/0437/0569/6409/files/xapawagonerivisusi.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000889d.bin
f9a8377eff4a85c11b9564e548273b14838fc6b99024b555a40c7aee5370e23d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x889D 5064 bytes
font_01_sfnt_off000099ef.bin
f1212516729f72f342b2437547a3791e47b0f6baf473953e5ab9560832af1a43		 pdf-font-stream PDF embedded font (sfnt) at offset 0x99EF 10032 bytes
font_02_sfnt_off0000bc79.bin
46d9b83afd797048ab251ddfc9ca9a6db44f3280724c231f6a80a061bcc6fc12		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBC79 16120 bytes

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