Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb44ae4e4ed97605…

MALICIOUS

PDF

41.3 KB Created: 2020-09-17 04:35:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f2b2d56234ccb98a7da65cf06b7b7e31 SHA-1: 788b24d45db4673f283f5e1301f965d98f271870 SHA-256: cb44ae4e4ed97605f87853087825068c83a2ab3586533b7ffbf315959b41644d
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a prominent link related to 'Premier student loan center website' which is a lure. This link redirects to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same malicious URL, reinforcing the phishing attempt.

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.link/pify?keyword=premier+student+loan+center+website
    • http://gimajuzo.neksscottishrite.com/uploads/1/3/0/8/130874384/vunuzevuvutesamada.pdf
    • http://vovudut.edushorts.com/uploads/1/3/0/7/130776255/gikedodaxomejinuzuvi.pdf
    • http://fidonetil.marymceneely.com/uploads/1/3/0/8/130814851/letoret-gumovizonelet.pdf
    • http://files.nursingarchivesassociates.org/uploads/1/3/1/3/131379615/73b4eb4e8.pdf
    • https://b9af07e4-bd08-4abe-93a6-96c928b2670c.filesusr.com/ugd/665c20_f82989ab80ce4fe8a83a5f3f261528ff.pdf?index=true
    • https://f512bf10-37cb-4a46-8cb5-241a66d867a0.filesusr.com/ugd/dcc11b_c04ed2104ee045e1a0ad4de688cab58d.pdf?index=true
    • https://cf576c42-d3c1-4f23-bd32-6f451960714b.filesusr.com/ugd/cb2bed_9f82c92d734a4d0d8ae76b2a2481647e.pdf?index=true
    • https://dc5e0ae5-8e7e-4120-bfed-b22d97f5f1ad.filesusr.com/ugd/ca32a8_f8c4c2a7714d4194b392d78d1b3cd519.pdf?index=true
    • https://00696670-bea7-4940-991f-469e970f1dec.filesusr.com/ugd/909b15_6926a30566654e91b33223fdea3b65e1.pdf?index=true
    • https://465b41b3-28d3-4216-a34e-7d9f9948dd81.filesusr.com/ugd/197ed4_c5c6d0866abb44c396bcdfe3247a2cd7.pdf?index=true
    • https://63a0b230-8692-4e8a-8d8c-2ddec29d181a.filesusr.com/ugd/a3b54b_faf8d13c7b854637bb55af8d76f91e4c.pdf?index=true
    • https://eafac987-674a-4130-8c30-8a6a892d235e.filesusr.com/ugd/c8df25_1b793da36bdf4842b4057e2de9e413b5.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0435/9805/3539/files/tisozegivat.pdf
    • https://cdn.shopify.com/s/files/1/0432/8616/7702/files/19554137182.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000061a5.bin
f7315e6c031f2135e73f141d15bbd71d724bb999bf454ae11f673d3de899ca35		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61A5 5316 bytes
font_01_sfnt_off000073ad.bin
3d1badb193cb0e6b72ce69f0ac0e445c4982e907d7553a3686c8b4279ccff0cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73AD 10676 bytes

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